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Please only attempt to get water from a tree if you know will be removed or is not wanted when practicing.
SHTFDAD has a nice video from Rob at Sigma 3 Survival school that illustrates how to fairly easily get water from a tree.
This could come in handy in a survival situation but according to the narrator is only effective 2 times a year (early spring and late winter) and works better with certain trees.
Rob also demonstrates how to use a root from the tree to support your canteen while the water flows into it. Enjoy and share the knowledge.