Dry and then store in sealed container with silica gel. Silica will maintain dryness, but will not dry filament by itself.

Also, containers must have a seal of some kind. Regular plastic tubs will let some moisture in. For a few days or a couple of weeks that’ll be fine, but over a month they’ll let moisture in. Get vacuum bags.

There are pretty cheap reusable vacuum bags that use a little pump. I use a cheap kitchen vacuum machine, and regular food storage vacuum bags.