Just choose what you want in them (apple sauce, yogurt, ect.) Sooo much cheaper than buying the throw away packs! (which my kids LOVE.) BooginHead Squeez'Ems Reusable Food Pouches Pouches): Baby must have!
All you have to do to make sour cream is stir in a few tablespoons of live yogurt into a cup of cream and let it sit in a warm place overnight! You can also use kefir or extra kefir grains instead of yogurt.