What I usually do when at the grocery store, I focus on some wonderful seasonings such as, Garlic and Herbs, Steak seasonings. Adobo, Old Bay, liquid smoke etc. I also like to roast potatoes along with the fish along with zucchini, green and yellow, eggplant, squash, the list is long its whatever you like.
Don't forget to pick up a couple of lemons and maybe some garlic bread. Grilled fish is a wonderfully light summers dinner to prepare outside. In other words, you know what you and your family like so go ahead and season your fish and other grill items with your favorite spices. There are so many seasonings to choose from I just named a few. Take your time in the market and look around, don't be afraid to try different things just be sure to read the labels and I assure you that you will be surprised at how you can make you food taste like five-star restaurant meals.
This is a very easy meal if you wanted to enjoy with friends or just with family if you don't mind spending more for good fresh fish, pork, chicken or beef and having a few good selections, then I would suggest checking out Wegman's market. Wegman's has a large variety of just about everything, I am sure you will be happy with whatever you purchase there.