I gave up on lifting jugs a long time ago. I use a 40 gallon bladder and the HF pump mentioned previously. It is the only way to go IMHO.
But if you really want to use jugs, here are the steps to get it done. This was posted by Starmaster a while ago Original Post (Post #9). Do a Search for "filling fresh water tank" to uncover more discussions on this topic.
================ Starmaster's Post ===================
Here's another option to put water in your fresh water tank when boondocking. This works but is a little slow, I can fill about 3 gals/minute doing this: (at least for our 3160 setup)
Connect water container with short hose to winterizing input
Flip winterizing valve to winterize
Connect outside shower hose to city water input
Flip city water valve to fill tank
Turn on water pump
Turn on cold water at outside shower
Pump until container is empty
Repeat as needed
disconnect all hoses
return all valves to normal position
If you put a bleach solution in the water container, this method can also be used to pump bleach/disinfectant into the fresh water tank.