I personally don’t believe that your touchscreen problems - more than a month later - are caused by the toilet dip, which you so proudly stated caused no problems.
I’m no expert I can only speak from experience.
When my FP2 fell into the toilet for about 2 seconds, there was water inside, I opened it up and let it dry for hours and when I tried it again the whole screen didn’t respond to touch input anymore.
I’m now going to order a new screen as it was obviously my fault. If your touchscreen problems were related to the toilet dip then I guess they’d have to have started right away.