I'm not on WIC but I can't have dairy. I never liked milk so never drink it. Not any kind of milk. And I find that I don't need it for anything. I sometimes use broth to make mashed potatoes. That is what some Jewish people do. Would add olive oil or Nucoa margarine because there is no dairy in it. And that worked okay if I was serving it with meat but eventually I grew tired of the taste of it. Now I make instant mashed potatoes with only water for the liquid. I do add a little extra salt and pepper for better flavor and sometimes I will caramelize some onions in a little olive oil and add those. Yummy!
If I eat cereal? I just eat it dry. Always have eaten it like that so no biggie. For baking, you can usually just sub in water. Milk will make bread more tender but... I never had much luck with most gluten-free baking, perhaps because I can't have eggs either.
Once in a while I will have a recipe that does call for milk. Such as the vegan stuffed potatoes. I believe the orginal recipe called for soy milk but I try not to eat much soy. Yes, it's in the Nucoa and most restaurants use it for cooking so that's enough for me. So what I use for those is rice milk which I buy when it is on sale. I found large cartons recently for only 99 cents. I used part of the carton for two different recipes and froze the rest. Not sure how well it freezes, but I'll see. I really use milk so little that I probably only buy one or two cartons a year. So it's not a biggie for me.
Some people use fruit juice on cereal. I've not tried that. I'm not a big cereal lover to begin with and when I do eat it, I don't want it to get soft and soggy.