I really haven’t seen any issues with people being able to find Topo Chico in my area. Maybe it’s just certain areas that are affected. From my understanding Big Red is supposed to be a cream soda type flavor. I remember seeing it in Kentucky when I was younger. Those Mexican coca-colas could be a dessert by themselves. Probably my favorite version of Coke. Speaking of pils have you ever tried Pilsner Urquell? If not I highly recommend itTopo Chico is my favorite mineral water. Seems to strike the right balance as far as the level of minerals and seems well carbonated. Irreplaceable for Ranch Waters, too. Seems to be a big shortage of Topo Chico around the country these days though. I was not excited when Coca Cola bought the outfit, but I thought the distribution would be better.
I have to laugh about Big Red. I had never seen it until I worked in Johnstown, PA for a time. I did not know it was a Texas thing, Seems the absolute epitome of a soft drink in many ways. Artificial flavor of no particular thing that I know of and color. Intense high fructose corn syrup. 20 oz bottle and very fairly priced. Great label!
The other Texas brisket beverage I would think of is a big old heavy glass 1/2 liter bottle of Mexican Coca Cola. Maybe an aforementioned ranch water. I do not know Pearl Snap. German-style pils they say. I love the sound of that, the can, and the fact that it is brewed in Austin. We need more craft German style beers in the States, especially lagers and pils.