Juice box options that aren’t juice?

Looking for some recommendations! Our kids daycare told us that our kids want to try the other kids juice boxes and dont understand why they don’t get them at snack time. We don’t want to start giving them juice yet (they are 18 months) but I feel bad that they feel left out. We let them drink coconut water at home sometimes but I can’t find coconut water in a juice box and the boxed coconut water is too big for them to handle without a teachers help. I googled some options and saw hint water but a lot of reviews complain about a chemical taste. I’m looking for something that is easy for them to drink themselves, that preferably has a juice box type container with a straw, but no juice. Any suggestions are much appreciated!