My only advice is to make using new potties kind of a fun game, so they aren't scary.
Let's see what the potty looks like here? This is a new one that we haven't seen yet.
I followed my daughters lead with potty learning, so we did it a little while camping - using porta-johns and some while travelling. For us it was a many months process with steps forward and backward. So we used lots of new potties and things while out and about travelling. I know some people's children learn the potty in a day, week or a month, but it took a long time with us.
I would explain things and follow his lead.
Let's see what the potty looks like here? This is a new one that we haven't seen yet.
I followed my daughters lead with potty learning, so we did it a little while camping - using porta-johns and some while travelling. For us it was a many months process with steps forward and backward. So we used lots of new potties and things while out and about travelling. I know some people's children learn the potty in a day, week or a month, but it took a long time with us.
I would explain things and follow his lead.