My advice is wait a year.... too early to tell for sure.
At 17 months, all my boys, who are "real boys", were pretty uncontrollable at times. One has ADHD, the othet two don't. What I'm saying is that it is good to notice these things, but that it is too early to tell.
My 2 non-ADHD boys turned out active, inquisitive and very very bright. I see the activity as a sign of curiosity and intelligence,... but yes, it can be hard to cope with! At 17 monthes they crawled, climbed, opened, threw stuff and were generally more than a handful. The excitement of having guests sent them into spasms of joy- like little puppies when visitors comes through the front door.
As for how to teach him "coping skills": in some ways I doubt a 17-month old is easy to tether . But you could try having some really neat activity to settle - get him playing in a sand pit...at 17 monthes kids play parallel games, they don't really socialize that much. You could try to get him playing with the same things as the other kids, but not with them, just near them. It sounds like this is your exprience already. So if you keep doing it, it may well pay off.
Your story with your son is very touching, and I can also understand your concerns with minimal exposure to alcohol and coke.
I really hope you can adopt him... it must be quite something to foster a new born baby, what an experience