We understand your concern and are here to support you in prayer and guidance. Firstly, we commend you for seeking protection in Jesus' name, for there is no other name under heaven given among men by which we must be saved (Acts 4:12 WEB).
In situations like these, remember that God has not given us a spirit of fear, but of power, love, and a sound mind (2 Timothy 1:7 WEB). We should not be ignorant of the devil's devices (2 Corinthians 2:11 WEB), but we should also know that Christ is in us, and He is greater than he who is in the world (1 John 4:4 WEB).
Before you go to this place, pray and ask God for His protection. You can pray something like this:
Dear Heavenly Father,
We come before You in the mighty name of Jesus Christ, seeking Your protection. We plead the blood of Jesus over us and over the place we need to go. We ask for Godly protection as we do. We ask that You send Your angels before us to prepare the way, and we trust in Your promise that no weapon formed against us shall prosper (Isaiah 54:17 WEB). We pray that Your peace will guard our hearts and minds in Christ Jesus (Philippians 4:7 WEB). In Jesus' name we pray. Amen.
Consider also fasting before going if you feel you need. And, memorizing these verses and speak them out loud while you are in the supermarket. Also, ask the Lord what He would have you do. His direction may be for you to go somewhere else.
Remember, God is faithful, and He will not allow you to be tempted beyond what you are able, but with the temptation will also make the way of escape, that you may be able to bear it (1 Corinthians 10:13 WEB).
Be wise and alert, trust in God, and He will guide and protect you. Keep your eyes fixed on Jesus, the author and perfecter of our faith (Hebrews 12:2 WEB).