What other milks are there out there?

We're moving away from dairy, my husband's insulin and glucose was through the roof recently. He's also found that when he drinks milk, it affects his sinuses badly (and I've noticed when he doesn't drink it he doesn't snore 😂).

He really likes cereal though, what other milks can we try? Or can we try milk powder? We've tried almond, coconut, soy and rice but just can't get used to the taste.