Yep, I lost a gimmie shot on an antelope a couple year's ago at Vance's place. I had a plastic water bottle in the cargo pocket of my pants, I was kneeling hunkered low, when I raised a bit to draw, the bottle "crinkled" the slightest bit....goat evaporation. Never again, bladders for me now, specifically the platypus since I found those.
Lucznik:
1) & 2) The Platypus insulated system includes a very thick heavily insulated tube and pouch that really helps minimize both of these problems. Also, on a regular uninsulated tube, a short puff on the valve will push the water back down the tube and then a bit of extra suction as you drink draws it back up.
3)Yep, no real way around that one.