L.S.
At 7 months, he's old enough to start having some solids introduced into his diet, so perhaps that could supplement his diet until you get home. Another idea is to try a different bottle -- perhaps the bottle, because the nipple is so similar to the breast, is off-putting. One other suggestion might be to try him on a sippy cup of some type; he may be ready for that and could get breast milk via that route.
The good thing is that even though he's hungry when you get home after being gone for awhile, he won't starve. As long as you keep options available for him (solids, different bottle, cup), he has the opportunity to eat when he's hungry.
Good luck!