This is a pan of water (to put campfire out) from the tap at Skidaway Island SP. Not sure what’s in it, or what it is, or if it’s just air bubbles.
In any case, for Raven’s water supply, we put a filter on the tap, put it through a portable water softener, then it’s filtered once again. Most drinking/cooking water is from jugs. (I’ll drink coffee made from our special drinking tap–that water is triple filtered…)
