I'm going to be playing around with some one gallon batches of experimental wines. Would I be able to use the slurry from one of these batches to start a full size batch of pee???
You sure can. I wouldn't use anything "too experimental" though. As long as it has a good flavor. The downside to a smaller slurry is that your total yeast colony will likely be smaller meaning that your ferment will take a little longer to get going.