Before we get into all this, I know you have a system worked out for you, and it works. It would be ill advised for me to try to change your ways, I think. I was answering Hash Hounds question,
"As usual with me, when I look into something new to try, confusion arises." And furter comments on the line.
However, since you brought it up... I'm not being argumentative, just trying to help out. But.....
The only thing I can say, is for the inside.... there are portable units.
Mikro Delta Portable 3 Stage RO System (Mighty Mite):
$103.00
This one has a quick connect to your kitchen faucet. . . Would beat lugging 30 to 50 gallons from Safeway... and since you have the gallon jugs, just reuse them once empty from Safeway. This one above does 20 to 50 GPD (1-2 GPH), depending on your water pressure...