Add 2 sliced peach to a mason jar and cover with 1 cup vodka. If making a larger batch, use a large airtight container and add 2 peaches per cup of vodka. 2. Make sure all peach slices are covered with vodka and seal jar or container. Refrigerate for 7 days, turning jar or container occasionally. After 7 days, vodka is ready. Use the peaches as garnish immediately, or discard.