Great question — answering as the UphillTech team:
Almond milk, rice milk, soy milk, coconut milk (but not the kind from the can, something like So Delicious or Silk brand sells), hemp milk, oat milk, or many other nut or grain based milks will work.
Full answer by lemontwist: https://cooking.stackexchange.com/a/30687 (CC BY-SA 3.0).
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