Twice in my past I quit taking asacol and Humira and both times I flared. It is nice to think you can get things under control if a flare occurs, but it seems that each flare seems to be harder to control (at least for me). I went from left-sided UC to pancolitis.... Remember that you feel good now because your are on meds.
At a minimum I would stay on Lialda. With issurance it is only $10/month (lialda card).
Humira loses effectiveness when you start and stop it. I know from experience.
Work with you dr on a treatment plan. If you both agree that meds can be off the table now, then at least you both will be prepared if things spiral out of control.
Hopefully it all stays under control for you. Some have had success with diet, while others need meds for success.