Welcome! Thank you for your question.
You can file to have the court adjudicate him incompetent and request that the court appoint you his guardian. This will place you in control over his healthcare and will give you the authority to force him in a treatment facility. This is not necessarily the typical guardianship but if you can show the court that your son is unable to make rational decisions based on his addiction then the court will likely appoint him a guardian.
Here is the Florida self-help site to get more information on guardianships. Please know that you will see lots of discussion about older adults. However, it is also made for this type of situation as well. http://www.flcourts.org/gen_public/family/self_help/guardianship/index.shtml
There are not any free legal forms that make this easy to do on your own. You may need to get the aid of an attorney. You may check with your local legal aid for a free attorney.
You can find legal aid resources here: http://floridalegal.org/
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