How can I help the dragon keep his promise?

Hint 1 of 12:

Try talking to everyone on this screen for advice.  A few previous hints will
tell you what you need to do to get close enough to them to strike up a
conversation.

Hint 2 of 12:

You'll need to get the memorum potion from the knight and give it to the
dragon.

Hint 3 of 12:

But the dragon isn't exactly going to drink that potion willingly.

Hint 4 of 12:

You'll have to trick it into drinking the potion.

Hint 5 of 12:

It probably drinks out the basin right next to its den (the big skull).  So
use the potion in the basin, and you're nearly there.

Hint 6 of 12:

Just find a way to make the dragon thirsty to solve this puzzle.

Hint 7 of 12:

Something spicy might get the dragon to drink.

Hint 8 of 12:

There is some paprika in the inn next door.

Hint 9 of 12:

And you also need the food to spice.