the second food source involes buying lvl 2 of construction

Okay try #4....

Added all of the requirements AND I did not let the stew get cold once.

Why does it STILL say unfinished stew???

Is there something else that nobody is saying but is supposed to be a common sense thing? Or a puzzle I didn't complete. Only puzzles I haven't completed are # 9, 11, 14, 15, and 16.

Maybe this is a glitch :\

The stew does work because I have completed it several times.

But if I have to add more than one food item, wouldn't that mess up the entire stew since it only calls for ONE of everything?

Don't think so. But what do you have to lose at this point.

Okay after one last attempt I found the solution:

for puzzle #11

The answer is :

^ Cover your spoiler.

And

So, um, I exhausted the berry supply.

I have Level 2 in Food Mastery, and Construction.

How do I get more sources of food?

Besides the 2 yellow fruit trees?

I suggest you read this thread for some answers on food sources.