Only when in custody does Miranda v. Arizona apply. Your confessions to the officers that you had 5-6 beers are admissible. What alcohol was found present after you consented to a search is admissible evidence against you. It will be used to substantiate your story.
You were not coerced. You were cooperative. You willingly were a witness against yourself. That means you cannot use the Fifth Amendment as your defense.
Do not try to defend yourself on the ideas you posted. All you will do in anger the judge by raising concerns that are not defenses and may be deemed .
Instead, if you want to keep your record as clear as you can hire a defense attorney.