Not the best but it's much easier and faster than the collapsable jug or silly funnel routine.
Materials:
male garden hose end
female garden hose end
2 hose clamps
small piece of RV hose
5' of clear poly 1 1/4 hose
You don't need the hose clamp on the water can but I opted to have it snug up with about 2 turns. It's pretty easy insurance so you can walk away from it until it's done emptying.