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with how much water do i mix my citadel-paints if i´m going to use them with an airbrush?

There's two answers.

First. Enough so the paint resembles milk. Ie it sticks slightly to the sides of the paint container but ultimately slides down. Something between 2 1 and 1.1 paint water.

Second. None, use proper airbrush thinners as they thin the paint without compromising adhesive properties.

I'm still relatively new to an airbrush outlive only used thinners and everything has gone well so far.

 azreal13 wrote:
There's two answers.

First. Enough so the paint resembles milk. Ie it sticks slightly to the sides of the paint container but ultimately slides down. Something between 2 1 and 1.1 paint water.

Second. None, use proper airbrush thinners as they thin the paint without compromising adhesive properties.

I'm still relatively new to an airbrush outlive only used thinners and everything has gone well so far.

This. I use Liquitex Airbrush Medium myself.

A general list of things you should have on hand if you airbrush:

Cleaning brushes(usually 4 or 5 wire brushes on a key ring, each a little bigger than the last). These are needed to scrub internal parts clean, especially dried paint.
Cleaning Solution. I use an airbrush cleaner that I got at a local craft store, made by Createx or something, a big name in airbrush paints. It works quite well, but is somewhat expensive compared to things like Windex(which can eat chrome over long periods of time).
Airbrush Medium. This stuff is designed to thin acrylic paints properly without destroying the suspension of the pigment in the paint like water does. Basically it thins the paint while keeping the pigment in place, so that you have even distribution of color in a thinner medium. It will allow for super smooth painting, as well as help fight against paint getting clogged in tips and such.
Airbrush Oil/Lube. Pretty straightforward. Oil up any moving parts, especially parts that rub against others like the trigger. A thin coat of oil on the needle can also help prevent clogged tips. Here in the US it runs about $7/bottle, but you don't use more than a few drops at a time so it should last a decent while. Assuming you airbrush every day and do a full break down and proper cleaning at the end of every week, you'd get a good number of months out of a small bottle.
Cleaning Pot. Basically it's a pot with a lid and a hole. You put the tip of the brush in the hole, and spray your cleaner through it. The pot collects all of the waste, and should have a little filter on it to prevent the majority of vapor from flying into the air you are breathing. I used to just use plastic cups, but a quick spurt of compressed air into a cup full of used cleaner made me switch over rather quickly.

Also, you should coat any rubber seals you have with petroleum jelly. This will prevent them from drying out(which all rubber does over time) and cracking, thus compromising the seal they create. This is needed more in dry areas of the world.