how do i make a block apear when water colides with a liquid

If get block at x: x y: y z: z = (Whatever fluid you want)

do replace block at x: x y: y z: z with (Whatever block you want)

All of this in When neigbour block change I think. I'm not sure if this is exacly the procedure that you need, because I don't know a lot about this, but I hope that this help. If this don't work, I'm sure that there has to be a little thing that I'm not thinking about and makes useless my code, but I think I has to work.

Sorry, It doesn't work, but I don't understand why.

There is a procedure template for this...

Well, I can't find that procedure template, but I guess it's somewhere.

If- [Get fluid as block at x: <x> y: <y> z: <z> = blocktype[  ] ]
do; Place block at x: <x> y: <y> z: <z>

Should work. the blocktype should be the one where you select a block, and replace x y z with the co-ordinates of the edge of the liquid, which should need 6 if blocks (or just an extra 5 else if sections).

if place block doesnt work, then replace block at x y z would work

It does not work. For some reason I can't replace liquids with any procedure, I tried all these ones.