We have a couple of questions about the legality of and how to tap trees to get sap. Tree sap is the source of sugary syrups like Maple or Sycamore. The sap can then be evaporated over a fire to leave a high sugar syrup (i.e. Maple Syrup).
While the process is not complex, it takes a lot of time and a lot of sap. If you want a cup (8 fluid ounces, 0.25 liters) you would need 40+ cups of sap (2.5 US gallons, 10 Liters). Additionally for Maple and maybe other trees as well, the sap is best for making syrup during certain times of the year, where particular weather patterns are occurring.
Assuming you have packed all the required implements with you, if you stop to camp for the night, could you tap a tree (or three) as you are setting up camp, and produce syrup for breakfast, before hitting the trail again?