What do you do with soup? The answer may depend on where and when you're from, I suppose.
"I'm going to eat my soup."
"I'm going to drink my soup."
BOTH of these sound a little strange to me, and not quite right. I suppose the first sounds less awkward to me, though, so that's the one I would probably say. But neither of them sound all that great, and I think I'd be most likely to just say "I'm going to have my soup."