One way to store your microdoses is to freeze them using a small silicon mold (1/4 tsp in each mold), pouring in the tea liquid you've made and putting it in the freezer. You can also freeze the rest of the liquid and save it for later. Or you can make the tea and just pour it into regular ice trays and after they are frozen, put them in a zip loc bag and grab one and put it in a tea as you need it.
I like to make my tea at the end of the day and just drop a few of these cubes into my tea. Makes it super easy!