I don’t have any photos on hand. If I remember I’ll upload some later perhaps.
But if you look at the Tucker systems (https://www.parish-supply.com/tucker-pure-water-system.aspx) the bag for that system essentially just fits inside a 4" pvc tube. You need one glued on end, but drill one female hose fitting in there before you glue it. For the other end of the pipe, you’ll want to find a fitting that glues to the pvc tube and screws shut to give you a liquid tight seal. Then in the cap you’ll want to fit the male hose fitting.
In goes the bag, screw on the cap, and done. You’ve got a Tucker ionizer for a fraction of the cost.