Not sure on the Hyperlite, but my Sierra has the antifreeze line at my water control panel. There's also a faucet for the sprayer. Put your water pump into sucking antifreeze mode, drop the hose into your portable tank, connect the faucet to the fresh connection and open the faucet with the pump on. That will suck the water in and pump it into the fresh tank.
Also, many folks have an external pump to do the same thing directly. I'm choosing to work with what I have, but either way works.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10