We are using distilled water with a tiny amount of red and yellow food coloring. Once in a great while we will throw a drop of ammonia in to give it a good little smell too, that requires a lot of flushing afterwords though.
Patrick S. Underwood
BS CCEMT-P NREMT-P
Simulation Coordinator
Southern Maine Community College
South Portland, ME 04106
(207)741-5604