Any ideas on the preservation of the concentrate? I know it probably should be refrigerated, but I made some last week and left it at room temp, thinking if it doesn't last a week at room temp it won't last on a lengthy trip or a resupply. Well, this morning looking forward to packing it up for a trip this weekend I opened up the container and low and behold, I had floaters (aka mold). <img src="/forums/images/graemlins/confused.gif" alt="" /> I'm stuck with coffee singles this weekend <img src="/forums/images/graemlins/frown.gif" alt="" />