yes it does, but you don't have to fill the water meth tank up exactly at the servo..
Just fill it up every weekend or something like that. As long as the tank has fluid in it the system will work fine. If it runs dry, stay off boost.
Also, bare in mind that its only misting water in during boost, so if you stay off boost, you aren't using it..
Also, these systems don';t do anything if you don't tune your car to them. If you have your car tuned with a shitload more timing and different afr's and you de-activate the system, you're motor will go "snap crackle pop" and then go bang.
its more of a permanent fuel improvement solution.
I'm going to whack one in, tune it to 91ron fuel (which would bring the quality of fuel to about 110 fuel) which would be like running avgas all day every day for $1.00 a litre (or whatever 91ron is these days) plus $6 a tank for the water and meth.
Apparently normal tap water can even be run through it without a problem. I might ever try it. If you use clean tap water (or even rain water) you'd save $3 a tank, meaning it would onl cost you $3 a tank extra to run avgas quality fuel in your intake.
I know its a high setup cost, but once its in....power...stability...engine longevity..etc etc..