I am trad and was thinking og buying a back pack for awkard jobs, gutters etc. Speaking to another window cleaner today he told me to make my own and save £s. I have got a puegeot estate and he seemed to think that I could purify water in my garage and carry water in drums in car? He also mentioned battery would be needed! Any advice or help would be appreciated! What would I need, could it be done etc.... Sorry to sound thick but I am a humble window cleaner!!!!