Is there a grocerystore w/in walking distance to the Comfort Suites, which is next to the Marriott .
That would depend on how far you can (or are willing to) walk, I suppose ;-)
Kirk's Market is about a 20 minute walk south of the Comfort Suites, Fosters at the Strand is about a 25 minute walk north, and Camana Bay is about a 15 minute walk North East, where you will find the Bay Market.
These are all easy to find using Google Maps.
And easy to get to and from on the bus. You could walk one way and then bus back.
While Bay Market is closest, know that it is a specialty market and comparatively small so limited in what they sell. Outstanding especially for cheeses and prepared foods! Kirks and Foster’s are more like large grocery stores in the USA with wide variety of items and departments plus very good prepared foods to take away. In the heat I would not chose to walk back to Comfort Suites toting groceries.
We walked it, then pushed the cart back to the condo. Bring your cooler for the cold items.