We are always looking for dairy substitutes. Other than the normal store bought rice/soy/almond milk we have used/found the following so far:
1. Tofutti Brand: Better Than Sour Cream and Better Than Cream Cheese (mixed with water)
2. liquified zuccini! (1:1 substitution)
3. Canned coconut milk!! (Delicious gem of a substitute, can be watered down for correct consistency)