I started off with a "direct" water connection hose but found that the caravan shower did not produce as much pressure as when supplied by the pump in the Aquaroll.
As I could find no way of adjusting the "direct connection" pressure I changed it for a "Ball cock" system fitted in the Aquaroll.
Pleased I did ‘cos I now believe it to be a safer system.
PS. If you store your drinking water separately from the Aquaroll, you can get away with the use of normal green garden hose instead of the mega expensive blue "food safe" hose.
Green garden hose will taint drinking water but is cheaper to buy in longer lengths.
Vin Blanc