Re: If you splurge on calories what do you do the next day?
Personally speaking, I would keep everything the same.
Remember, what we're looking for is not really a diet with weight loss, but a lifestyle change. To do this for your entire life you DO need to have days where you can be a bit indulgent. I don't believe it's wise to punish yourself by withholding food or adding additional exercise...but that's just me.
What I do suggest is this. On the days that you know that you will be indulging,
eat more healthfully and less calorically. Then you will have "saved" your calories
for some, or all, of your indulgence.
Enjoy and be healthy!