Basically you have just written the letter!
You will start out with the following as elements in the letter:
1. Date and place of charge
2. Circumstances surrounding the arrest. You need to admit to having been under the influence and whether you knew the person whose phone you took.
3. You will give the value of the phone and whether you returned the phone to the police or the owner.
4. You need to make a statement what action you have taken regarding your drinking habit and whether you have stopped drinking as a result of learning the harm it creates.
5. Set out the efforts you have taken to give back to the community. I don't think you should mention the work for the bar! You want to make yourself look to avoid bars, PERIOD.
You do not have to inform your character witnesses of your criminal history. They do not need to include that in their letter but should speak to your good moral character, honesty and trustworthy attributes.
Generally, USCIS can take into consideration ANY act regardless of whether there were criminal consequences that reflect on good moral character within 5 years of your application for naturalization.
If you know your blood alcohol level and it was relatively low, you may want to include that but definitely you want to express you have learned the dangers of alcohol and have stayed away from it since this incident.
I hope I’ve provided the information you were seeking. If you are happy with my service, please provide a positive rating. If not, please let me know so l can continue to help you.. In the future, you may begin your questions with “FOR JUDITH” and I will be your personal immigration expert. Understand, it is my job to be honest and truthful about the law and sometimes the law does not give you the solution or options you want. If you feel I earned a BONUS, I am grateful. I will remember you and review our question history. Thank you.