Water
Collect water with a transpiration bag
A clear plastic bag tied around a leafy branch on a sunny day can yield a cup or more of drinkable water.
Step-by-step
Pick a non-toxic, leafy branch of a healthy tree in direct sun — birch, maple, and most conifers work well.
Slip a clean, clear plastic bag over as much foliage as possible and tie the mouth tightly around the branch.
Angle a low corner of the bag downward so water collected during transpiration pools in one spot.
Leave for 3–5 hours in strong sun; a mature branch can produce a half-cup to a full cup of water.
Drink directly or filter through cloth if debris got into the bag.
Warning: Never use this on toxic species (oleander, yew, poison ivy, poison sumac). If you can't identify the tree, don't drink the water.
Related outdoor skills
Educational reference only. Wilderness conditions change fast — practice in low-stakes settings, take a certified wilderness first-aid course, and confirm regional regulations before you rely on any of these skills in the field.