Second unsweetened Vanilla Almond Milk! It’s not super strong, but to me the added vanilla flavor tastes much better than dairy milk. Plus, it’s only 30 calories/8oz with no sugar, and is fairly cheap when I get Kroger’s generic brand.
I’ve also found that using vanilla almond milk makes it more tolerable to use plain nonfat greek yogurt, which seriously cuts back on the calories and sugar vs flavored greek yogurts. For whatever reason, I like how Almond milk mixes with oats, granola, or cereal, maybe because it’s a little thicker and more flavorful than the skim milk that I was drinking previously.