What's closed in Belgium on New Year's Eve/Day? [closed]

What businesses in Belgium are open on Dec. 31 and Jan. 1?

We plan to visit the Netherlands and Belgium from Dec 25 through Jan 5. We'll be in Belgium on Dec. 31 and Jan. 1. How much will holiday closures affect us? In particular, what will be closed on Dec. 31 and Jan. 1 (or limited, e.g. reduced hours, reduced schedule, reduced ticket-sellers)? Specifically: Will we be able to buy train and bus tickets? Buying groceries? Will restaurants be open Jan. 1?