I keep the mason jar lid closed so I'll have more fizz in the drink.
The grains sure do multiply lol! I keep my extra grains in a mason jar in the fridge, maybe you could get another jar just for storing the extra grains. :-)
You can take both tinctures together in water or in juice, I take my cayenne and hawthorn tinctures together in a splash of water.
If you're wanting something for memory, Uny's Brain Formula tincture is great, it's got Ginko in it.