I have a little PUR filter on the galley sink faucet. I refill all my
drinking water bottles using it as the filter, and it tastes great. I
also use it for cooking water. The regular tank water is fine for
showers, cleaning, washing hands, dishes, etc. I have fiberglass tanks
that, no matter how much I clean with bleach, etc., still pick up that
"fiberglass" smell after a couple of weeks. I use up the water in the
tanks at least once a month and refill with fresh.