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Obvious solution: remove all hose and run new, which involves removing panels and manoeuvering in very tight quarters.

Repair difficulty level: medium

Effort level: extreme

Cost: $$ to $$$

Not so obvious solution:

Repair difficulty level: easy

Effort level: minimal

Cost: 2$, including tax, at Canadian Tire (provided someone leaves you a perfectly good piece of otherwise useless potable hose)

How does one fill the tank?

Just screw a potable water hose hooked up to a potable water supply to this new fresh water intake.

When not in use, place a baggie over the new intake and secure with a rubber band.