I live near the border. Can we still go shopping across the border?

 In

Belgium & The Netherlands:
The borders of Belgium have been closed to non-essential movements since Friday 20 March 2020. The Belgian police carry out border checks and any violation will be strictly sanctioned. You do your shopping in the country where you live and as close as possible to your home.

Can I still visit family and friends?
Which rules apply in the supermarket?