In a large bowl, combine the water and vinegar and set it aside.
Peel and rinse all of your potatoes and then slice them using the slicer attachment and large chute of a food processor. You want the slices to be about 1/16in (.16cm) and uniform. Add the slices to your water/vinegar mixture and let them soak for 20 minutes.
While the slices soak, go ahead and mix together the BBQ seasoning into a small bowl. Then, set the seasoning aside.
When ready, dry the slices by sandwiching them between kitchen towels or paper towels. Take care not to overlap slices. You want to get rid of as much moisture as possible before frying.
While the potato slices dry out, pour canola oil into an enameled Dutch until it's about 2-3in (5-7.5cm) high. Turn the burner to medium high-high and heat the oil to between 360-375°F (182-190°C). Keep a thermometer handy to check temps before and during cooking.
Prepare some more paper towels on a baking sheet or large shallow bowl and get your seasoning ready.
Add as many potato slices as will create a single layer over the top of the oil to a spider or large slotted spoon; typically, somewhere between 1/2 and 1 full potato. It's okay to stack the slices at this point, because it's more important that all of the potato slices go into the oil at the same time for even cooking.
When you add the slices, they will bubble quite a bit. Gently stir continuously to stop hot spots, separate any slices that stick together, and make sure the hot oil is hitting each chip (crisp) equally. The temperature will drop considerably once you add the slices. You want the oil's temperature to drop into the 275-285°F (135-141°C) range during the first 2 minutes of frying. Stir until the slices have stopped bubbling almost completely, about 3-4 minutes. The oil temperature should end somewhere between 300-315°F (149-157°C).
Scoop the potato chips (crisps) out of the oil and add them to the prepared paper towels. Directly after, sprinkle the chips with seasoning and transfer them to a bowl for serving.
Wait for the oil temperature to rise all the way back up before repeating the next batch. Repeat frying and seasoning until all the slices are gone.
Once all your batches are done and cooled off a bit, check your seasoning with all of the barbecue potato chips (crisps) together. Powders stick pretty well, even after the chips have cooled a bit. If you want a more even seasoning or want to add a second coat for funsies, sprinkle more seasoning over the top. Then scoop and toss with your hands a bit before adding any more seasoning. Continue to toss until you are happy with the result.