You definitely need to contact a local traffic/criminal attorney - who will have some insight on the court and the typical fines. It is unlikely that you will be charged with DUI - but I have seen it done in similar situations before. The fact that you were cooperative with the police may have helped you avoid a ticket for DUI.
The .187 BAC reading will result in a suspension of your drivers license. However, your attorney may be able to challenge the suspension and have it rescinded.
If you are found guilty of illegal possession of consumption of alcohol by a minor, this will also result in a suspension of your drivers license (3 months).
Please note that this is not legal advice and is not intended to create an attorney-client relationship. The post is only an opinion. You should speak to an attorney for further information. The poster is licensed only in Illinois.
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Two corrections to the previous answer: 1. Your license will be suspended for three months EVEN IF you get court supervision (you do not need to be convicted) AND 2. The only relevance of the BAC is that it proves your illegal consumption. The only way to avoid the suspension would be if the state agrees to amend that charge to a disorderly conduct or something else that won't affect your license. You are extremely fortunate you weren't charged with DUI or at a minimum, that they did not write you up for a Zero Tolerance Summary Suspension of your license. Most likely the state will want you to plead to the illegal consumption charge, since you've already caught two huge breaks; you cannot get any kind of exemption to drive during that period.
It seems like you've been lucky so far, relatively speaking. So why not have an attorney go over everything and appear in court to make sure you get the best outcome possible? Look for someone who has relevant experience, as well as a solid reputation among judges and other attorneys. If you need a referral, feel free to give me a call. 800-517-1614.