It depends on how much water comes out of your shower head.
1 gallon
depends on how much you want, like i have 700 gallons.
Because to fill up a bath you need to use a lot of water, this water is more then what a typical person would use to shower (showers use less water/min then filling up the bathtube)
millions of gallons of water
1/4 GAL
A shower head would use between 60 to 75 gallons for a 30 minute shower.
You can make the whole shower experience a game. For example, who can get to the shower first, use the water toy guns to play a shooting game with your child. Use dye to dye the water in the water gun. Tell your child he will get a treat at the end if he/she behaves in the shower.
Some ways to use less water are, turn off the water when you brush your teeth, take a bath instead of a shower, and do not run to much water when you do take a bath!
Shower, because you don't need the water below the surface and it is already dirty. It's like sitting in your own used dirty water so you'll be dirty anyways so why use water. If your taking a shower your using clean water and you can turn off the water when you don't need it.
switch off lights when your not using them only boil as much water that you need don't use too much water in the shower switch off the PC when not in use
A shower door water stopper is designed to prevent water from leaking out of the shower enclosure. It acts as a barrier to keep water contained within the shower area, reducing the risk of water damage to the surrounding floor and walls. The water stopper is typically installed at the bottom of the shower door to create a seal that prevents water from escaping when the shower is in use.