This guide will tell you where to find Moisturous Things for Panepane in Xenoblade Chronicles 3.
First, you will need to go for dark grapes which are very easy to find as they are only 15%.
Head to the Aetia region, the region before the Panepane. There is a cave around here in the hilltop caravan, so you need to go through that cave and you will find dark grapes, which will turn into alot of stuff after the quest.
If you die here, you will respawn right outside the cave. As it is 15 %, so you need to collect a total of 7 dark grapes. After that, get back to paint and complete the quest.