No kosher food available

I’m converting to Orthodox Judaism. I’m in a small town in the Deep South. No kosher butcher. No deli. No grocer. Nothing. I’m living off of Hebrew national hotdogs. I found a canned tuna and one cheese I can eat. Other than fruits and veggies….my diet is very limited. I have a kosher cookbook but I can find few of the ingredients. Is it better to suffer poor nutrition and stay kosher or eat the occasional Walmart beef or chicken?