*HELP* Temperature controlled RGB for a swimming pool

Hello everyone, I am new to arduino and I am looking for advice on a project. So.. I have swimming pool that is heated with wood and I want to add RGB-leds that illumintates the inside of the pool so that temperature of the RGB:s matches the temperature of the water; for every degree the water warms up, the color temperature also gets warmer.

My question is, what hardware should I order for this project? I noticed there a different models of the arduino. Which one would suit my needs best?

Thank you in advance
Robin

I like the DS18B20 temperature sensor. Easy to use and digital output.

Which Arduino board?
Any of them would work since you only need two GPIO pins.

My personal go-to board is the Wemos D1 Mini.