[gordons]

can anyone tell me how to change tap water into pure water. If i need a machine how much would it cost about and how long does it take to change? Thanks.

[windows_chepstow]

Ian_Giles has recently shown me his RO set-up.

You need an outside tap and connect the RO unit:

See here:  http://www.ro-man.com/shop/product_info.php?products_id=33

To it.  It filters your tap water into a large water container; for example a water butt.

This can take 24 hours to get a water butt full; depending on your RO (so I believe).  You'll then fill up a number of manual handling water containers to transport your pure water to where you're going to be cleaning.

Carefull not to overload your vehicle.  1 litre of water = 1 kg.

Along with the back pack you'll need to purchase a brush and pole.