im using a coopers micro brew kit and iv just done the first brew , now im going to be doing some stout, when priming the bottles i used carbonation drops which came with the kit and they say use 1 for 345-375ml bottles or 2 drops for 740-750ml bottles , if i can only get 300=330ml bottles or 500ml bottle how many drops do i use or how much sugar do i use. is normal sugar ok or is there some thing better,