I have a fabulous iced drink cup made of recycled glass that I use for iced coffee and iced tea in my office at work. The problem is that it's not insulated, and leaves a puddle of condensation on my wood desk. It feels very wasteful to put a paper towel under it every day, and I tried using a washcloth and managed to spill it everywhere. :( I need a coaster that ABSORBS condensation and doesn't just collect it or let it puddle. Something like a beer pad that the bars use haha. HELP!