What I do for the 4 cup coffee makers is to bring my own small basket filters. They are special 4-cup coffee maker filters, even though I have used the larger ones and folded (or maybe cut) them. I then bring my own ground coffee and usually mix a flavored coffee with regular coffee (what I do at home with the coffee beans). Just stick in a little scoop or an 1/8 cup measuring cup and you are good to go. I've also brought the little individual coffe packets that I've bought at our grocery store, but I like a mix of regular and flavored coffee so I prefer to bring that.
T&B