This was a simple set up done on my kitchen table.
I had my 7D on the tripod almost level with the paint-pan about 3 feet away. My flash with diffuser was to the right of the pan and the reflector was to the left. With the ziplock bag suspended above the water I poked a small hole in the corner. Getting a focus lock was done by putting a pen (or anything really) exactly where the water was dropping and manually focusing in on the pen. After about 25-30 shots I got what I was after.