Yes, you can use other beverages. And the newest guidelines for water say that foods, like fruits and vegetables, that contain a lot of water also count. Personally, I'm a purist and prefer beverages. If you could alternate a beverage like ice tea then water then club soda then Kool-Aid that would be good too. It's never a good idea to force yourself to eat or drink something you don't like. But I'm not a fan of consuming a lot of artificial sweeteners etc.
With the cooler weather if you have a lot of soups, that will boost fluid intake. If you're doing a good job on the fruits and veggies that's a big help too.
Please let me know if you need anything else.
Pat Baird, MA, RD, registered dietitian