How we researched this guide
We compared the overnight lens-storage question and checked lens-care and eye-health sources before writing. Every search result for this exact phrase is about contact lenses, not car parts. This guide answers the lens question honestly and recommends no substitute liquid.
We did not test any product hands-on. Maker claims are written as rated or stated by the maker, and owner experience is paraphrased from the linked sources.
The 30-second answer
There is no safe one-night substitute for contact solution. Do not store lenses in tap water, bottled water, saliva, or homemade saline, and do not sleep in lenses that are not approved for overnight wear. The safe choices for one night are to wear your glasses, or to throw the lenses away and wear a fresh pair tomorrow.
What people search for, and what the answer really is
Contact solution is the liquid that cleans, disinfects, and stores contact lenses. The phrase in this article’s title comes from people who have run out of solution at night and want to know what they can use just this once. The honest answer is disappointing but simple: nothing in your kitchen or bathroom does what contact solution does, and the common substitutes people try are the ones eye doctors warn about most. This guide explains why, and what to do instead.
Quick compare: what people try vs what it actually does
| Substitute people try | Cleans | Disinfects | Safe overnight |
|---|---|---|---|
| Tap water | No | No | No |
| Bottled water | No | No | No |
| Saliva | No | No | No |
| Homemade salt water | No | No | No |
| Rewetting drops only | No | No | No |
| Proper contact solution | Yes | Yes | Yes |
How to choose what to do tonight
First, check what lenses you wear
Daily disposable lenses are made to be thrown away after one day. If yours are dailies, the answer is easy: take them out and throw them away. Monthly or two-week lenses need proper solution to survive the night, and without it they should not be reused.
Never use tap water
Tap water can carry Acanthamoeba, a micro-organism that causes a rare but serious eye infection linked to contact lens wear. It can also carry other germs that solution is designed to kill. Water does not disinfect, and it does not clean protein and deposits off a lens either.
Saliva is worse, not better
Saliva is full of mouth bacteria. Putting a lens in your mouth or wetting it with saliva moves those bacteria straight onto your eye. Eye-care sources are consistent on this: saliva is never an acceptable lens fluid.
Homemade saline is not sterile
Salt dissolved in water is not the same as sterile saline. It is not disinfected, its salt level is a guess, and the container it sits in is not sterile either. It will not clean or disinfect a lens, and it can sting and irritate the eye.
Rewetting drops are not storage fluid
Rewetting drops are made to moisten a lens already in your eye for a short time. They do not clean or disinfect, and they are not a storage medium. A lens left in drops overnight is a lens sitting in fluid that germs can grow in.
What to do instead, in order
Wear your glasses
This is the best answer for one night. Take the lenses out, store them dry only if you plan to throw them away anyway, and wear glasses until you can buy solution. Glasses cost you nothing and risk nothing.
Throw the lenses away
If the lenses are dailies, throw them away. If they are monthlies and you have no solution, throwing them away still beats risking an infection to save one pair. A replacement pair costs far less than an eye infection.
Buy solution in the morning
Contact solution is sold at pharmacies, supermarkets, and late-night stores in most towns. Buy the same type you normally use: multi-purpose solution for most soft lenses, or hydrogen peroxide solution if that is what your eye doctor prescribed. Do not switch types without asking your eye doctor first.
See an eye doctor if your eye hurts
If you already stored lenses in water or wore them after a bad night, and your eye is red, painful, sensitive to light, or your vision is blurred, see an eye doctor promptly. Do not wait to see if it gets better on its own.
Can I sleep in my lenses for one night?
Only if your lenses are specifically approved for overnight wear, and even then only as your eye doctor directed. Most soft lenses are not approved for sleeping, and sleeping in them raises the risk of infection because the eye gets less oxygen and germs are trapped against the cornea. One night of sleeping in day-wear lenses is exactly the kind of shortcut that causes problems.
Troubleshooting
| Situation | Likely problem | What to do |
|---|---|---|
| Out of solution tonight | No safe substitute exists | Wear glasses, discard lenses |
| Lens stored in water | Contaminated lens | Throw the lens away |
| Red, painful eye | Possible infection | See an eye doctor promptly |
| Dry, uncomfortable lens | Deposits or dryness | Remove lens, wear glasses |
| Wrong solution type | Irritation risk | Use only your prescribed type |
Who should NOT follow substitute advice
Anyone who wears contact lenses: substitute-liquid tips found online are not safe advice, even when they come from well-meaning people. The eye-care guidance is consistent: only proper solution cleans, disinfects, and stores lenses.
Anyone with a red or painful eye: do not try to fix it with a different liquid. See an eye doctor.
Final verdict
There is no safe one-night substitute for contact solution. Wear your glasses, throw the lenses away if needed, and buy proper solution in the morning. One night of glasses beats a week of an infected eye.
Frequently Asked Questions
What can I use instead of contact solution for one night?
Nothing is a safe substitute. Tap water, bottled water, saliva, and homemade saline do not clean or disinfect lenses. Wear glasses for the night or discard the lenses.
Can I store contacts in water overnight?
No. Water does not disinfect and can carry germs, including the micro-organism that causes Acanthamoeba infection. A lens stored in water should be thrown away.
Can I use saliva to wet my contacts?
No. Saliva carries mouth bacteria onto the lens and into the eye. It is never an acceptable lens fluid.
Is homemade salt water the same as saline solution?
No. Homemade salt water is not sterile, its salt level is a guess, and it does not clean or disinfect. Sterile saline from a sealed bottle is only for rinsing, not for storing or disinfecting.
Can I sleep in my contacts for one night?
Only if your lenses are approved for overnight wear and your eye doctor said so. Most soft lenses are not, and sleeping in them raises infection risk.
What if I already stored my lenses in water?
Throw the lenses away and wear glasses. If your eye becomes red, painful, or sensitive to light, or your vision blurs, see an eye doctor promptly.
Are rewetting drops a substitute for solution?
No. Rewetting drops moisten a lens in the eye for a short time. They do not clean, disinfect, or store lenses.
What type of solution should I buy?
Buy the same type you normally use, or the type your eye doctor prescribed: multi-purpose solution for most soft lenses, or hydrogen peroxide solution if that is what you were prescribed. Do not switch types without asking.
Sources & changelog
Manufacturer and maker sources:
- What contact solution is, Warby Parker
- Contact lens care guidance, American Optometric Association
- Biotrue vs OPTI-FREE PureMoist comparison, Optix-now
Changelog — November 5, 2026: guide first published. No products are recommended and no affiliate links are included, because no substitute liquid is safe to recommend.
By Leo, Founder, WinchInsider
Leo writes WinchInsider guides from maker specifications, manuals, and owner reports, so readers can choose workshop tools with facts instead of guesses.