Off topic for the thread but seeing as you highlighted it: isn't 'liter' the US spelling, while 'litre' is the (correct) UK one? (I'm in Ireland, and tend to cringe when I see 'Americanisms' :( )
Just because it's "litre" in the UK and "liter" in the US doesn't make one correct and one incorrect. The latter is the correct spelling in American English.
It shouldn't, but it gets to be a lot of milk. Most people (that aren't dairy sensitive) could probably stomach a few more cups (8 fl oz.) without losing it, maybe up to 1/2 gallon. Throwing up usually happens when people try to drink a whole gallon in an hour type thing.
Same here, plus you could throw in some stevia & cocoa to make it chocolate milk without adding much extra energy.