I would never use water to see to see what the finish looks like. Alcohol my be ok but not mixed with water. As Kevin mentioned, water is used to raise the grain to sand off when you are using a water based topcoat. I know you are going to hate hearing this, but I use a spritz of mineral spirits to see what the wood will look like with oil on it.
Just like everything else in life, woodworking is a trial. You will know better next time you want to mix tropical woods with light woods. I’ve seen it happen. I’ve seen guys build a chess board with Paduck and Maple. Then sand it all down and end up with a horrible mess! The oils in the Paduck leached into the Maple.