Glycols are miscible with water so water will mix with DOT 3 and 4 brake fluids. As previously stated, DOT 5 silicone fluid is not miscible with water, and the water miscibility test is good way to positively identify silicone versus glycol brake fluid if you aren't sure what you're dealing with.

The other products are probably all mineral oil based since they don't mix with water and rise to the top. Mineral oil specific gravity is less than water, so petroleum products, even heavy crude oil, will float on water.

Nice work, thanks for the photos!

Duke