Ok, I still haven’t tried to figure out the temp of the chilled water in our fridge, but googling around, including the company website for my fridge suggestions that it’s probably slightly more than 2, maybe 3 degrees celcius.
So that would put it at the bottom end of the range in the advice, but still warmer than water with actual ice in it. In crucially, much colder than tap water.
If I ever get around to trying to measure the actual water (maybe I can use the meat thermometer?) I’ll report back 😁