I used to have dreams about smoking for a few years after I quit. They eventually stopped. I hated waking up feeling guilty.

It's more than the chemicals in the food when you taste them and digest them, though. It's epiphenomena like texture, aftertaste, "weight", and other attributes of food you eat that doesn't involve chemistry can elicit cravings in the body.

Alternatively, you could distill your own water. Admittedly, this involves an initial investment, but you can find designs for stills on the internet, usually meant for making spirits. If you just use water, you'll collect pure water which you can partially remineralize later.

A big part of a hangover is dehydration. Stay hydrated and drink while you eat.

Maybe not from Germany... Eggs are usually safe if pasteurized since they have their own packaging.