MIV: I didn't realize you were looking for information. Wild grapes, such as the ones you describe, are mostly useful as a food source for wild animals, but if found in sufficient quantities, can be used for making wine and jelly.
What you describe sounds like what we call "possum grapes" or some folks call them "fox grapes" in other parts of the country. They're basically lots of seed, lots of skin, and little pulp.
Other forms of wild grapes grow in most areas; wild Concords and "mustang grapes" here in East TX, also blue muscadines. They are all edible, but mainly used for jelly and wine. I have 4 commercially-acquired grapevines, one transplanted wild Concord vine, and one bronze muscadine vine in my orchard that I tend. They give me more fruit than I can use and I give away a lot. Grapes are fairly easy to tend and will last for decades if cared for.
Most wild vines are sterile and can be used as you describe (water source, firewood, leaves for cooking, etc). If you find a good vine, take a rooting or cutting and transplant it, or just get one at your local nursery. There have been several discussions on the care and tending of grapes, here on this thread, or we can do it over again if you're interested.