I have the large Cuisinart for K-cups and it comes with a plastic fill your own pod that stores in the side of the machine. I use it to mix my own herbal tea blends - vanilla rooibos with strawberry rooibos or whatever tickles my fancy at the moment.
I used to have a Tassimo and the hot chocolate syrup clogged it to the point where it could not be used, despite me cleaning it every time. Mind you, I got 4 years out of that machine.