I tested out four different flavors: almond, lemon, orange, and mint. Since I was testing, I didn't want to make large batches (in case they didn't work out). For each extract I started with 1/2 cup vodka. For the orange extract, I added the rinds from 1 1/2 oranges. For the lemon extract, I added the rinds of two lemons. For the almond extract, I added 1/4 cup raw almond slivers (no skins). And for the mint extract, I added a small handful of mint leaves.