How do you sweeten unsweetened cereal?

I get free cereal on WIC. The only problem is only the unsweetened cereal like Kix, Cheerios, Corn fFakes, sugar free rice krispies. etc.. are allowed on WIC. Unsweetened cereal is for the birds. I end up giving the cereal to my mom or someone else. P.S, sugar won't dissolve very well in ice cold milk.lol