Call your Escrow officer; they should have one on file. Make sure your broker takes a look as this is a legal document. I usually have the escrow/title department set this up and send out to all parties. I think, I might have one on file I will email it to you.... more
Please read this excellent article on shared well agreements.
Not all well agreements are created equal and some are far worse than others
Given a shared well agreement is a legal contract, obtaining legal advice is strongly advised.