Hire an aggressive attorney to fight this bogus charge. I understand the notion of constructive possession but this sounds like a beatable case. Good luck
1) You may be able to fight the charges, depending on the facts of your case. You should consult a lawyer and go from there. Either an experienced private attorney or, if you cannot afford one, a public defender would serve your needs well in an under the influence (HS 11550, I assume) case.
2) If you have no prior record and your HS 11550 charge was not accompanied by other criminal charges, you may be eligible for Deferred Entry of Judgement. The DA will let you know if you are eligible for DEJ. This is a program where the prosecution of the case is delayed pending your completion of a 18 month program. Assuming you complete the program, your charges are dismissed.
Either way, you should consult an experienced criminal attorney and have them analyze the facts of you case. Good luck!
Did they take your blood? If not, I do not believe they could prove the elements of a HS11550 unless you made some admissions and an experienced DRE evaluated you. In any event, have an attorney review the reports to see the reason for the stop, etc. If you did not do PC1000 for whatever reason, the statutory minimum for this charge is 90 days county jail (work release). Get an attorney.