re: the magnet trick: I could easily imagine a plastic water bottle with a detachable magnet in the base -- or two magnets where one rotates to enhance or cance

re: the magnet trick: I could easily imagine a plastic water bottle with a detachable magnet in the base -- or two magnets where one rotates to enhance or cancel out the other. In any case, you'd fill the bottle, neutralize or remove the magnets, give it a good shake, let it sit in the sun, and then reactivate the magnet. Then either: the magnet is strong enough that you drink from the bottle right then, being careful not to drink all of it; or you twist the bottom to trap the last 5% of the water at the bottom with the powder. Next time you fill the bottle, you untwist to mix the water, reactivate the magnet, expose to sunlight, and repeat.