 That's why so many families get sick during trips. And that's a risk you don't need to take. Instead, make sure everyone has a full water bottle. The only silver lining in drinking caffeinated pop is that it'll probably make you stop more often for potty breaks. But it's not worth it. Third, stay away from those fast food drive-thrus. Pack some carrots and celery, maybe some apples. You'll like yourself in the morning and when you look in the mirror.