I read a lot that without water you will die in 3-6 days. But does that include eating? What if I didn't drink water but ate foods (particularly dry ones without water content)?
If you didn't drink any water but ate dry foods, then you'd die in about three days. Just keep in mind of the environment as well. If you live in a dry place then you'd die faster. If you don't have any rain or moisture that seem through the air, then it's also likely you'd die fast.
Eating food wouldn't save you; from what I've read the no water thing will kill you in anywhere from 3 to 7 days. The 7 days is generously speaking and the range is on average. There are documented cases of longer without water but we are talking avg person avg conditions.
"5. Eat Food: The rule of thumb governing survival hydration and food is a simple rule. If you have nothing to drink, then do not eat. Eating anything, even watery foods, takes water from your system to create the slurry that will be able to move through your GI tract. Eating without drinking can lead to constipation, or worse, an intestinal blockage. If you are suffering from dehydration, and have watery foods available—try squeezing out the liquid through a cloth. I’ll often do this with summer berries to create a drink. Blueberries, raspberries, blackberries, and other watery wild edibles can be mashed and squeezed to make a juice that offers hydration and even a few calories and vitamins, without wasting the water it would take to pass all those skins and seeds."