This may not be totally practical for you but works for me. On a previous TT, I replaced the sick-water-buffalo-sounding water pump with a variable-speed drive pump and so had an extra pump lying around. I configured it with hose ends and when I need water, I carry 5-gallon blue jugs from the hydrant, and pump it through a filter into the FW tank.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam