running That really, really sucks about fresh fruits/veggies.
Are there at least local alternatives you can eat? Re. sweet potatos- they are weird here too (I'm in India)- long and thin and white inside, not nearly as sweet. If those are the ones you have, I think you can use different cooking methods to bring out the flavor. I can't remember off the top of my head which one is the best- perhaps boiling as opposed to baking, makes them more flavorful and less tough.
I haven't had to adjust too terribly much- I just can't make anything with fish/seafood, cheese, or grains other than pasta or rice. I'm pescatarian so that's not too difficult to do, but I really do struggle with getting enough protein. The hardest thing is not having my Whole Foods health foods- nutritional yeast, protein bars, quinoa, flax, greek yogurt, etc. My bf is a carnivore and not getting any beef in the land of the sacred cow has also been hard for him.
Yogurt makes a great substitute for sour cream! I think there are numerous recipes out there for homemade sour cream that involve yogurt + lemon or vinegar, something to that effect.
Do you mind sharing what continent you are on/country you are in? No worries if you don't, just curious