Don't know the lay out or space available on your boat but will give you my two cents worth!
We do a lot of backcountry camping (LNT) Leave No Trace, ie pack it in you pack it out.
With a little pre planning you can cut your garbage by up to 50%, if not more, pre plan your meals so there's little waste ie steaks with no bones (fillet mignon my favorite), pork tenderloins etc. I use grocery bags for garbage bags and then place in a three gallon bucket with a lid that seals. If you know someone with a pool the buckets that have the chlorine tablets works great and fit in my compartment at the back of my boat. By compacting beer cans, water bottles etc. Two people can go a week with only 3 gallons of garbage. It will take practice, but it's not that hard.
Just be thankfully you don't have to worry about the raccoons or skunks getting into your garbage
Good luck Bob