Have you tried several types of sippies? Or other people? He may simply be unwilling to take it from you?
FWIW, the soft Nuk sippies (practically bottles, but nipples shaped differently) were the first things I was able to get DD to actually 'drink' from. The other things, she would literally 'sip'. Then straw cups worked next.
SAHM to Magnolia May (09/10), Luke Russett (04/13) and expecting 11/16. Wife and best friend to my airman.