kmoore3883,
Welcome to the forum.
Sorry about your diagnosis, UC sucks that's for sure.
Lots of folks here have had some success with the SCD diet, specific carbohydrate diet - which is pretty strict.
So, I would recommend you start off by being dairy, wheat and gluten free to start off with and then see if it helps you. I agree subdued about the food journal - it will be the only way to really definitively determine what really does not agree with you.
As far as supplements are concerned:
a good probiotic like VSL#3 is important, L-GLutamine in large quantities for colonic repair, slippery elm bark powder for healing.
Have you had your Vitamin D and B12 levels checked?
Are you on any rectal meds?