I’ll go first. After your turn the water off in the shower but before you get out, use your hands to wipe off any standing water on your body. Maybe even give your legs a bit of a shake. This way, you won’t drip nearly as much when you get out, keeping the floor and your towel drier.
I try to always keep 30L to 50L of water safely stored in the food cellar.
If you store it properly it can stay safe and drinkable for years, I replace it about once a year though.