James
Your costs for these things will be far lower than ours, usually a minimum 20% but the bladder was $124 AUS and the filter kit including faucet was $125 I used a premium food quality hose I think about $4 metre.
Cut a lot of costs by using a snazzy little tool to use stainless wire instead of hose clamps which will be handy for heaps of other things too.
The inlet is under the rear seat (see mod for rear arch), it is a two way valve, one way is for the shower and the other is a inlet/outlet depending on the configuration of the y valves for the pump.
This outlet is normally capped and when we need to use, just use normal garden hose fittings to attach 10m of food grade hose which can be used as a washdown or to drop into a water supply or attach to a mains faucet.
The pump is self priming and it will lift reasonably well but due to no vent on the bladder it is imperative that there are no air leaks or you get air in the bladder and then have to pump it out.
The faucet uses a ceramic disc if you go to
http://cgi.ebay.com.au and water filters the one we used was from member supplier71 but think I changed to larger hoses, you should be able to find a comparable sytem (but cheaper) over there as the filter bodies are US made.
As for time have no idea, it was all part of several mods going at once and don't think there is anything I would change except the extra hole I drilled in the galley top for the extra faucet (not required).
Note we use all food grade hose to cut out taste/smell problems.
Thee are lots of swish sytems but many are much larger and dearer like$900 AUS but at the end of the day they only use similar cartridges except like the AMWAY one which uses a light or magnets to supposedly work extra miracles.