How can I fix a water damaged Beats Flex?

So I recently went on a hike with a friend at the end of it, it started pouring rain now It was in a bag that I used for hiking. After I got home I did my things that I needed to do and soon got my Beats Flex out and had my mom charge them. Well soon after I went to use them and they were at 2% so I went to the charger I was using that worked all these other times and it wouldn’t do anything I would press the button to turn on and it would blink red like 2-3 times and stop. idk what to do

[Re-Titled by Moderator]