Pleural effusion. A pleural effusion is excess fluid that accumulates in the pleural cavity, the fluid-filled space that surrounds the lungs. This excess can impair breathing by limiting the expansion of the lungs.
There are 1.5 ounces in a shot. There are 64 ounces in a half gallon. So there are 42.6666667 shots in a half gallon or about 42 1/2 shots in a half gallon. You can find this out by going to Google and typing: shots in half gallon or the long way by typing: ounces in shot and ounces in half gallon
If you're reading an American recipe, and dealing in American cups, then as the other answers say, it's eight cups to half a gallon. However in other parts of the world, a gallon is rather more than in the US. In the UK, a pint is 20 fluid ounces, or two and a half US cups, so a quart is 40 fluid ounces (5 US cups) and thus half a gallon, or two quarts, is in fact ten cups. If you're dealing in metric cups, then one cup is quarter of a litre (250ml) which is close to 8 fluid ounces, but not exact.