I don't know german, but I guess you are asking for a water shader..
Why don't you search forum before asking for anything anyway?

Here you go:
water shader (real-time reflections)
Also, there is an awesome rip from the shade-c, search for it!


Edit: and I guess, it's still better to ask for help in english, even if you know it little bit.
That way it will be easier for you to get some help around here. Anyway good luck!

Greets