Save yourself a couple of gallons of water and pee in the shower! But make sure you're shampooing or otherwise scrub-a-dubbing simultaneously, or that half-minute while you just pee will use up a as much water as a toilet flush (older showers use about 4 gallons/min, newer ones about 2.5)...plus shampoo adds a delightful flowery scent! Also, perhaps do it in the beginning of the shower to ensure it all makes its way down the drain by the time you towel off. And for those of you with roommates, remember pee is virtually sterile!