DH and I usually economize by planning only one meal "out" per day and shopping at Chedraui or Mega. In fact, we have a standard and very specific shopping list of what we purchase for each trip. Breakfast is light, not only for the price but also for the meal itself as we are not big breakfast eaters, especially before diving. We usually keep on hand juice, milk, jelly in the small fridge or cooler. And then we keep bagels, crackers and cereal to make up quick and easy breakfasts. One morning per vacation on a non-dive morning we do like to try the breakfast buffet at Jeanies. Overall, we find the light breakfast in our room, then the fantastic SI snack provided by our dive op Blue XT Sea diving is perfect for us.
Lunch very often is sandwich, cheese, fruit (washed properly of course), chips/pretzel. We also keep all of this stuff in our room/condo as well. We actually much prefer to take this time, usually after diving in the morning to clean up, relax on the terrace or by the pool. Although, as mentioned, places like Chilangos, Sabores or any other comida economica are perfect for lunch. $5.00 -$7.00 pp is not bad at all, especially considering what you get for the price. We do enjoy a couple of lunches out such as Chilangos, Sorrisi's for a medium pizza or Asadero El Pollo on 30th for the chicken, which we bring back to our room.
Then, after we are rested, we spiffy up a bit and go out for a night out on the town to visit one of our favorite restaurants. DH and I have a list of must go places. Sorrisi's (Mussels Marinara with on site made fettuccine) , LaChoza, Kinta, and Wynstons for the Killer Crab Macaroni and Cheese and La Perlita on 65th (Try the seafood soup..OMG !!) Very often the entrees are very large and we share. Not only does this cut down on cost, but then there are no leftovers to deal with. If for some reason we find it is not enough, then we just order more, or grab a snack later either at another place around town or back at our room. All of these places actually have prices that compare to dinner out here in Austin. Neither DH and I are big on Alcohol/Drinks so by default we save a lot of $$ there. Although, we do make our donation to that cause on our visit to the East side as long as our diving schedule allows the indulgence. Nothing like iced buckets of Sol, lying in a hammock and looking out at that beautiful view
Hope this helps. Have a great time ! Sue