When Ig tells his brother Terry to swallow all his pills, Terry puts a few in his mouth and uses the little bit of liquid in his glass to swallow them. There shouldn't be any liquid left after that. In the next scene with Terry, the glass is full, as he swallows more pills.
Ig Perrish: People say you should always do the right thing, but sometimes there is no right thing. And then, you just have to pick the sin you can live with.