I have to be able to clearly see the bottom of the cut before I drink the water. The presence of a few floaters, sinkers or suspensions in my water does not bother me. Zooplankton add protein. A little grit helps the digestive tract. Makes it feel homey.
Gas heats best.
I eat food cold. No sweat, just slobber with fuel. Sure, in a tent. I can't even get my stove to light. I love the smell of napalm in the morning.