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The last one you get is for the hotdog eating contest. You need to get to the highest weight level in the game to beat the last contest, so the sandwich is very much end game content. As for the rest, you need the vials for the bagel and the wagyu beef and the gold dabloon for the fairy, both are bought at the curios shop, and both the flavor enhancers and the High quality greens are locked behind Tiffany so you need to unlock the lab for them(Also one of Cici's endings result in Tiffany going away but don't worry, that doesn't stop you from doing Diane's stuff).

All 6 of the ingredients are key items you get by completing tasks for different characters. 

Fairy dust from Ophelia the fairy

The perfect bagel from Sweet Cravings

Wagyu beef from the waitress at the all-you-can-eat

High quality greens from Diane

Flavor enhancers from Cici's quest line.

Homemade condiments from the hotdog eating contest.

Remember that these are all key items, so they'll show up on your inventory screen, not in your ingredients list.

Whenever I try to stream I just get this error message and trying to run it in browser just gives a message saying "no valid memory adaptors"

One thing I would like to note assuming your still working on the sequel, having the wings make you faster is not helpful. Generally in bullet hells, it's much more important that you can make small movements to slip between bullets so going faster only makes it harder to dodge. 

If I could make a suggestion, you could make the wings unlock 'focus mode', a feature used in most bullet hell games that makes your hitbox visible and makes you move really slowly for easier dodging. Upgrading wings could increase the amount of time you can use focus mode.

That means you need to buy better work out equipment from the mall.