Ok..here's the scoop. You should never put the RV antifreeze in the fresh water tank. You will have a hard time getting the taste out of the tank.
There is a siphon kit that hooks to the intake side of the pump. The kit has a long hose that is used to siphon the antifreeze directly from the gallon jug. Works like a charm.
Drain the fresh water tank and flush it with fresh water. Might need to do this a bunch of times to get rid of the taste. Good luck.
2000 Cherokee 29BH with 6V batteries, LED lights & 400 watts of solar power, flipped axles and raised. 2007 Tundra 5.7L DC-LB with lots of mods. C-co, 8/158th AVN Maint.