The Dec-Jan 2005 issue of Field and Stream has a brief article on this subject. A sidebar describes the TP Heater. You will need one toilet paper roll, a small coffee can with plastic lid ( or any can just big enough to hold TP) and 2+, 16 oz bottles of rubbing alcohol. Remove the carboard core, compress TP and slip into can. Add alcohol and allow to soak in. Light edge of TP. When it starts to turn brown on edge you need to extinquish and refuel. The plastic lid is to keep fuel from evaporating between use.