Re: Which is the more appropriate?
get 2milks both with different coloured tops showing it semi skimmed or whole milk, pour 1 milk in a big flask that will empty the whole milk bottle, pour the other milk bottle in to the other bottle, swope lids, pour the milk from the flask back to the other milk.
but before you do it, remember to swope the one that they hate most with yours.
you win. they don't drink, game over, all to yourself.