It's really up to you what glass to use. It'll depend on the size of batch you want to make each time. I make just under a pint each time. If the container you use is too big for the silverpuppy to sit on the glass without falling in you can tape 2 chopsticks or dowel rods together so the raised bit of the silverpuppy (--|__|--) balances on them & the rods keep it from falling into the glass.
Again how much to take, depends what you take it for, I take a mouthful, roughly a single spirit measure - around 25/30 ml (don't know fluid oz) in the morning & at night & swish it around my mouth a lot before swallowing.