I was going to come back and add magnet fishing as well, after seeing a post about it but totally forgot.
I would recommend getting as big and powerful one as you can. I started on the small ones and quickly realized that they’re not very fun because it basically has to be right on top to get anything. They’re great for fishing stuff out of tight spaces like drains and such though.
https://www.amazon.com/dp/B07HM9W522?tag=metalpursui0a-20&linkCode=ogi&th=1&psc=1
Put the phone in a bag of rice. The rice will suck moisture out. Or try this product, it works amazing drying things out.
Dry & Dry" [1 Quart Premium Orange Indicating Silica Gel Desiccant Beads(Industry Standard 2-4 mm) - Rechargeable Silica Gel Beads(2 LBS) https://www.amazon.com/dp/B01I5Y2DG6/ref=cm_sw_r_cp_api_glt_fabc_3J9EQQJ4E83MKAKFAM4A