Use a solar shower hung over your bathtub. Stand in a big tote so the shower water doesn't go down the drain. Dump one gallon of the shower into toilet to flush #2. Don't flush pee, or pee into bottles or bucket and use it to flush #2. It's all very doable and uses very little water.
If the water is off and you need to use the toilet, here are some alternatives to consider: Use a Bucket or Lined Trash Can: Place a trash bag in a bucket or a lined trash can. This can serve as a makeshift toilet. Make sure to have some sort of cover for privacy.
Throw a Bucket of Water into the Toilet Bowl
One of the simplest ways to manually flush your toilet is pouring a bucket of water into the toilet bowl. You'll just need a bucket containing a gallon or two of water. Older toilets may need 3-5 gallons of water to start the flushing cycle.
Remember, the toilet tank fills up right after a flush and remains that way until it is used again. That means it should be full in the event your water supply is cut off, so you still have one flush to burn. The wise homeowner saves that flush to use only in the event of an emergency.
Repair or Replace the Trip Assembly
If it's not working or positioned poorly, the flush cycle may not complete, leaving the tank empty. Detach the toilet tank lid and check the trip assembly fastened to the handle. If it's out of place, reposition it. If the assembly is bent, worn or busted, replace it.
The way toilets work: Flushing when water is shut off doesn't do any damage, it just empties the tank. No biggie, this is a normal operation when changing the parts in the tank or doing other maintenance. You will never be able to fill above the toilet bowl line unless there's a clog.
Method Without Removing the Tank Lid: Lift the toilet seat and lid and dump the water from the bucket into the bowl with one pour. Don't pour the water slowly; this will only fill the bowl. Instead, pour with as much force as possible to create a strong flush. Repeat this step until the bowl is clean.
Shut-off Valve Location. If your toilet is produced or manufactured in America, you can usually find your shut-off valve on the back left side of the toilet.
A waterless toilet uses a straightforward mechanism that involves no extra materials. This design only requires sunlight and wind to turn human waste into a compost like substance. When you go to the toilet, the waste material collects in a small compost chamber beneath the bowl.
Some people have bowel movements several times a day. Others only go once or twice a week. A general rule is that going longer than three days without pooping is too long. After three days, stool becomes harder and more difficult to pass.
This is called the “gravity flush,” and all you need to do is quickly pour about 1.6 gallons of water into your toilet bowl. The gravity flush creates enough pressure to push whatever is in the bowl down, and you don't need to push the toilet handle to flush.
Fill a bucket with about a gallon of water and toss it in. The idea is to make it flush. If it doesn't flush you didn't do it right or it wasn't enough water.
Common reasons for the water to shut off include a closed valve, a water heater malfunction, leaky pipe, or an issue with your water supply.
Shutting off the water supply when leaving for an extended period can prevent potential leaks or flooding while you're away.
Most toilets work without power, with the primary exception being those located below your sewer line. This is because your average toilet can rely on gravity and how water flows to get its contents from your home to your city sewer line or septic system.
Use a Bucket to Flush a Toilet Without Running Water
All you need to do is quickly pour about 1.6 gallons of water into the toilet bowl. The hardest part of flushing a toilet this way might be getting the water. If the shutoff is planned, you should fill up a bucket or two with water before turning off your water.
If a toilet or other plumbing fixture with a drain pipe is not used, the water trap will eventually dry out and allow sewer gas to enter your home. It is a good practice to flush all toilets and pour water in all sinks and shower drains every week or two.