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sailaway-
One argument that has come up recently is that many of the minerals a body needs (like calcium) ordinarily are in tap water--and are removed from bottled water. I don't know if a multivitamin cures this, I onyl note there's an argument that "pure" water isn't what we were evolved to drink.
Wombat-
There's a great little gadget called a "Steripen" that takes 4xAA cells and runs a very bright UV-C light to sterilize water, sold mainly to campers. Take the "flashlight", stick the business end in a bottle, turn it on for 60 seconds, voila, you've got a pint of sterile water. That much UV-C at that range will break down ANY AND ALL DNA in the water, rendering it safe. $100US and goof for some 5000 pints of treatment, IIRC.
You can similarly, buy a larger UV-C light designed to be installed in your plumbing line and run from ships power, to sterilize your drinking water without chemicals. If you've got any good 60's black-light posters in the main cabin, they'll probably look good under it too.
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