quick recipe: 2 TBS grind in a ball with 300 ml water. Shake for a minute and pour into a jug. Then do another wash with the same ball using 200 ml water. Shake for two minutes, add to the jug with the first wash and mix. That should make you a half litre of decent grog. If you need it stronger than that, experiment with using less water, down to as far as 200 ml on the first wash and 150 ml on the second. And of course, you can drink that, then repeat in a half hour for the start of a good session.