Nope...never used iced tea or anything else but water for a gravity bong. I pose this question, though: Have you ever used a LONG downstem on a gravity so it gets water-filtered? We did it w/ our 5 gallon sparkletts jug...worked nicely.
its caled a gravity bong beacouse gravity is pulling the water down inside the bottle beacouse its being lifted above the relative water line the falling watter causes suction thus pulling smoke into the chamber. now as for not using the fluid in the G bong yall must be lazy not to put a stem in it i cant stand swollowing that much hot dry ass smoke its not that hard to hook up a drop stem for a G bong so it bubbles/