Illinois state park alcohol rules

I kept hearing that SC state parks disallowed alcohol. Some parks make you initial that they told you so. I sent an email to the dept of parks and recreation and their response was in a nut shell: they have no control over what you may or may not consume in your motorhome, fifth wheel, travel trailer, or even a tent. They do disallow the public display or consumption of alcohol. So don’t get drunk and make an A$$ of yourselves, and they will leave you alone. If you MUST walk around the campground with a beverage, don’t take it in the bottle or can it came with.