Blimey, this is all so complicated!
I almost always walk 5 days a week and my routine is this: one black coffee and a bowl of Frosties (with soya milk) for breakfast. Set off around 9.30. A small Hobnobs flapjack after about 30 minutes. A small banana around 11.30. If I'm walking more than about 15 miles, I'll have a second small flapjack at some point, and for a longer walk I'll sometimes have a second small banana. I have a modest lunch when I get home - usually mid-afternoon.
I don't have a big dinner, but I'll graze on biscuits, fruit, chocolate, sweets, nuts & raisins, doughnuts or whatever else is available during the evening - walk or no walk the next day.
My BMI is 19.5 (the low end of healthy) and my weight hasn't changed by more than a kg either way in 50 years.
Oh, and I drink half-a-small-bottle of cider (sometimes even a whole one!) most evenings. My favourites are Angry Orchard (very apple-y) and Thatchers Rosé (very refreshing).