I wet my brush, apply toothpaste, brush for 2 minutes, spit, rinse brush off. Far less than 4 oz of water. That makes sure I don't swallow a single drop of the f e c a l choliform contaminated tap water.

 

When I shower, I take a "Navy shower". Wet the body down, turn off water, soap up, shampoo up, use a cuticle brush as a wash rag to scrub every inch of my body, removing dead skin cells,  and stimulating acupuncture points. Apply face moisturizer, shave, turn water back on to rinse everything off. Turn off water.  Second shampoo. turn on water to rinse off again.

 

Total time water is on ... less than 45 seconds, closer to 30 seconds.