How to dry out a wet passport?

A substitute for silica is rice - that is more easily available. Submerge your passport in rice with all the pages separated.

One very fast and reliable way it to simply leave your open passport next to a fan - put a fan onto a table and put the passport onto some raised object in front of the fan. Once the pages closest to the fan dry out (which is like in half an hour) you can proceed to other pages. Alternatively you can interleave the pages with something like pens or similar size objects so that they are separated and then the process will go much faster.

I've used tinfoil to separate the pages and stood it on the radiator this worked a treat : )

Using an iron on a low setting with a dry towel in between the pages works good. Then place a weight on top of the passport while it is still wrapped in the towel. It will look clean and pressed when finished. Just did it for the 2nd time in 6 months. Accidental swim with the passport in my rear pants pocket as it did the backstroke in the washer

I just now found out that if you wash your passport and live in west Texas, you can just let it sit on a table in the back yard at midday. That moisture will disappear by the time you finish your second Shiner Bock.

Put paper towels between each page and a large pot with heavy cans inside to flatten the covers.