Well I had to cut some cabbage for the restaurants so to the woods I went got thirsty so cut some grape vine for the water here a few pictures about 7 oz total.
No, but in places where the water has more diseases and parasites than we want in our body; water from vines are safe to drink. Avoid white sap and colored or foul smelling sap. Let common sense be your guide. One of the best ways is cut a ~2' section out. As you'll get more water, cut at the high end first, then the low end. If you cut the low end first, capillary action will draw water up the vine. You'll still get water but a lot less.