Bokken is able to show you some of the remaining berries that he hasn't juiced yet before you leave.
You are almost done exploring this area when the sun sets. You are able to go for a few hours longer before your horse grows tired. You also need your few hours of meditation as well. It may be a good idea to set up camp and rest.
Spoiler: OOCYou can make a perception test to try to identify the potion you bought.