I'm a criminal defence lawyer in Toronto and have been doing this for many years. What I would say is this:
1) Don't take any legal advice from a forum.
2) Hire a lawyer, or at the very least, an experienced paralegal to assist you. Even lawyers hire lawyers. Police officers hire lawyers. Judges hire lawyers. No matter who you are or what you know, you can't effectively represent yourself. Simple as that.
3) It's serious enough of a charge that spending a bit of money now will likely save you a lot more later on (insurance, potential for jail, etc.).
4) Don't assume your version will be readily accepted by the Court. Everyone (police, witnesses, suspects, etc.) all have their accounts of what happens on any given event. People assume that because they are telling the "truth" they will be acquitted. If there was a simple way to determine that, I would be out of work a long time ago. Your "truth" (even if correct) is just one of many versions the Court will consider.
5) Your statement may or may not be admissible depending on complicated legal issues surrounding issues of voluntariness and alleged Charter right violations. There is no simple or definitive answer to this - it is a judicial determination based upon a sophisticated legal analysis borne out in court through evidence. This is one of the many reasons hiring a lawyer/paralegal is a good idea. Also, the remedy follows the violation - so, hypothetically if the Justice of the Peace or Judge were to find that you should have been cautioned and/or read your rights before making a statement, that only (typically) means that your statement is not admissible. Everything else in evidence is still admissible (i.e., the case does not get "tossed" simply because a statement should not have been taken). Again, complicated stuff with no clear answer and lots of nuanced legal issues.
6) Legal assistance may not be as expensive as you think. It could range between hundreds to thousands of dollars but in the end, it is about the value of the service, not the price. If a lawyer saves your driving record and insurance rates at half the price they were going to increase, then its a good value. Either way, most lawyers will meet with you at no charge in an initial consultation (including me) just to give you a sense of what they think of your case and the costs associated with it.
7) Careful with the defence of saying you were under the influence of drugs because that is a criminal charge (driving while impaired by drug) and so that may actually cause more problems. I appreciate you say you were drugged by someone else, but that doesn't necessarily end the issue and exposes you to greater risk.
Also, all your posts here would be admissible in evidence to cross-examine you upon and impeach your credibility with potential inconsistencies and/or lead in chief as a voluntary statement if the officer happens to come across it and they can prove they are your admissions (not very hard to do as a matter of circumstantial evidence). It would be a sad bit of irony if you had your statement of identification of driving excluded only to be proven by your postings on this board. Be careful what you post everyone.
Good luck and see #2 above all.