A dryer costs about as much as 2 rolls of cheap filament, and if you don’t print very often then you’ll probably waste more than 2 rolls to failed prints. A dry box with desiccant can also work, but it doesn’t remove moisture efficiently - it just keeps things dry, so it won’t recover your wet filament.
On the other hand, if the trick with the heated print bed is working for you, that’s probably good enough. A cheap kitchen scale will tell you if it’s removing moisture.
*Ballmer peak