I just did this for a garden hose so if you want the python just for refilling look into a garden hose.
I just went to the garden store and got some brass fittings. Couldint tell you what kind, but it took me some time.
Heres what they are.
1- 3/4'male threaded male to 3/4'' threaded
1- 1'' female threaded to 3/4'' male threaded.
Check with the size. I used a new shower head in the store to check.