For the current ships, Disney carries the Twinings brand of tea bags (and some ritzier brand of loose tea in the upcharge coffee shops.). The soda machines have Fuze iced tea (but I don't think there's decaf..I remember unsweetened and a raspberry one). If you only drink Lipton decaf vs other brands, I'd bring your own sealed pack, and some packets of Truvia. Sorry, I'm not positive what brands of non-sugar they carry.