For some meals yes, but most of the time the serving sizes are fine. I use the filtering options so I get more calories from proteins, maybe my recipes are more filling?

I use a meal planning app (Mealime), just fill in the amount of people/servings. Pick a few recipes and you have your grocery list for the week. We eat with 2, so I just set my serving size at 4 people and eat the leftovers every other day.

I don’t have experience with mead/melomel. But it looks like you have too little headspace? For beer I would leave 1/3 of the vessel for headspace so the foam doesn’t go through the water lock. I think the seperation is normal