Infusions are easily personalized, you could very well make a few different batches and hand out various treats to your family but I like to brew one big batch of something flavorful, label it with the particular year it was made, and then give it away with a bow on top. Over the years I have infused many different liquids, and I will now look at the options with you.
Microbes are the oldest life form on this planet. They can be found in the air we breathe, the water we drink, the food we eat, and indeed inside our own bodies. Check out how food-hackers are changing the flavor of coffee with these tiny organisms!