As I know there are no supermarket that accept Bitcoin for payment. Bitcoin is not legalized worldwide because of some reasons so it's not easy to find out a offline shop, store or restaurant that accept Bitcoin for payment but I think with it's possible if you want to buy anything online cause there are a lot of online market that you can use your Bitcoin and cryptocurrency to buy anything you want as long as Bitcoin is not banned in your country 
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Using bitcoin is not illegal worldwide except for few countries (less than four countries have banned bitcoin). So legalization is not the issue here. The main problem is that not many people are willing to go through technological stuffs. They rather wish to stay and run their business in simple traditional way. But spread the words and let them know how much beneficial bitcoin is and they might give a second thought.)