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The raw rice remedy you suggested to @lusciouslucy is true and raw rice is readily available. There is an even better option.

That small paper bag that is commonly found in packaging, containing some grains or small objects. It is called a "desiccant packet" or "silica gel packet."

These small bags are there to suck out all moisture and keep the product dry at all time, it contains contain materials like silica gel, calcium chloride, or activated charcoal, which absorb moisture and help maintain a dry environment.

So gey a munber of this bags, put it in a box and put the device in the box and close the box [Remember to remove the battery].

Depending on how many bags you can get, it will sick out all the water from inside the phone. Call this process First Aid for a drowning phone

The problem with this method I the fact that those bags are not always available.