If you think about it, the fresh water tank is made from "food grade" plastic. The "expensive" bottled water you buy in even an "upgrade Eco store" comes in "food grade" plastic bottles. For the past 40 years, we've been using the water in our RV FW tank for cooking, drinking, bathing, flushing the toilet, etc.
Honestly, if you care for the tank (by sanitizing it) and use the water frequently enough to keep it fresh, it's really not much different than turning on the tap in your stick built house.
As for an "infrequent" glass from an "unsanitized" FW tank, that's probably not much different than an occasional drink from the garden hose at home.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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