Yes I used the fx_water_mirror but I have A7 comm and this supports render to textur. So imho it kind of works already but the result has some little error.
Maybe it's not totally clear what you see on this picture so what you see are two spheres, behind each sphere is a flame and the sphere are penetrated by the water plane in their middles (it also happens if there is no intersection between water and objects). The flames are behind the spheres and thats correct in the view but in the effect on the water it's then wrong. Is that normal?