Yes you can if you buy from shops that accept them. Once Get a bitcoin Visa or Mastercard to automaticaly convert bitcoin to fiat. This way you have 100% in BTC and convert in the last moment when you need it.
It depends on the grocery store or the market if they allow the bitcoin to become a payment tool for their business.
Some businesses are still not that knowledgeable about bitcoin due to its centralization. Also, it is volatile so maybe grocery stores are scared that they may lose the value of it when its price goes down.
But hoping that this adoption will become put in to place as this is what we need right now to prevent physical contact during payments. I heard about the bitcoin ATM where we can withdraw bitcoin instantly and hoping that more bitcoin ATMs should spread globally so that it is more convenient to us if we needed to do that.