It's best to wear rubber gloves and eye protection
Tear up some steel wool and put it in a jar.
Pour household vinegar over it , enough to fully cover the steel wool.
Wait 24 hours or longer.
I experimented with the use of tea before applying the vinegar steel wool solution.
And some washing soda water solution for bleaching.
But i only used the vinegar steel wool which stood for three days before i used it.
I put on the solution with a paint brush and immediately wiped it with a rag.
I used some transfer paper for t-shirts to get the text on the wood.
Look here for more details on printing on wood.
I put on a beer brand ,but you could also put something else on.
Or in a different color.
When the text had dried i sanded it a bit.
I couldn't get of all the wax.