If you are looking for non-dairy milk, oat milk is a great place to start. Low-cost, fast and easy - it's delicious too. You can use it anywhere you'd normally use cow's milk - including in béchamel sauce for your lasagne!
Chocolate or Vanilla flavored milk you can have around anytime. Doesn't spoil, tastes great and gives a great pack of fiber and nutrition. Lots of alternatives to cow's milk are preservable, easy to make and inexpensive.