I use the Keurig for non-coffee, like hot chocolate and tea, but without the specific K-cups. I got a big container of hot chocolate, scoop it into a cup, and brew the Keurig water on top. I also have put a tea bag into the K-cup space and brewed it the regular way (no K-cup needed), and it worked like a charm. Or, just brew hot water on top of the tea bag--your choice. Making your drinks this way can save some $.
I want to try to hot apple cider K-cups, but haven't had a chance to get them yet.