Tell us about yourself!
The water that gathers there isn't due to dew or condensation at all, it's there as a result of transpiration, the process by which a tree releases oxygen and water through its leaves. Different trees release different amounts of water depending on leaf shape, size of the tree, rain production, season, and temperature. It's perfectly drinkable, assuming you start with a clean bag, and tastes slightly like the tree itself. It's actually quite pleasant, much better than boiled water in flavor.