A pair of socks works well, (much the same concept as the paper towels). In the evening put on the dry socks and put the boots back on for a bit. The socks will soak up the moisture. If things are real wet you can wring out the socks and repeat the process. Then dry the socks by air dry, fire, ect... Then in the morning put the boots on for a few minutes with dry socks. Once the socks get damp, take the boots off and change into dry socks. Hang the wet socks to dry during the day.
I try not to dry boots by the fire. Good chance of melting a $250+ pair of boots. I dry socks next to the fire.
I also change socks mid day if my feet are wet or sweaty, and put antipersperant on my feet to keep them from sweating. I also bring camp shoes so I can get out of my boots and let things air out. By keeping the skin on my feet from getting damp and soft I prevent blisters.