Now, this is interesting. i've heard of flavorings before but never to make your own infused drink. If this is the case, I will definitely order one or two in the next week or so.
Here's Sky's recipe:
1 1/2 shot Vodka
10 drops Peanut Butter Capella Flavor Drops
1 shot Kahlua
1 shot Baileys
The site where the flavors come from is called Capella Flavors. Apparently, with each flavor you get, it's enough for 600 drops. Additionally, you can get even larger bottles if you want. Either way, it's a great deal if you just want a plain vodka and want to add on later without running and buying a whole other bottle of vodka.