https://www.natureword.com/properties-and-benefits-of-grapevine-sap/... I dug it up today and water is only coming out of a big root that was cut, some sort of vine that grows into the trees ( apparently grape vines ? ) ... I thought it would make a natural water hole for the chickens but not so sure I trust the water rom the roots?
That link is for human use but it describes collecting vinesap - maybe slip or tape a tube over the end of the vine to collect it?
Grape should be easy to identify. Even if you aren't sure, it is a way to keep the sap out of your run.