Put the loose herbs into a Bodum French Press to steep (the tea bags can be steeped in a mason jar or teapot). If you don't have enough room for one full litre of water when steeping, you can steep using as much water as fills your container and then top up the concentrated tea with the rest of the water when you bottle it.
Cover the Bodum or mason jar to keep the volatile oils from escaping with the steam.
Allow the tea to steep and cool for 30 minutes to 4 hours. I usually brew the tea in the morning, and by lunchtime, I bottle it up and put it in the fridge.
When the tea has cooled add lemon juice, and if you like a sweeter tea, then you can add liquid stevia, another herb that has great health benefits.