Light
The scenario generally goes like this: This plant is from a forest biome. Now, there are many tall trees in the forest. The miracle fruit plant, being a shrub, is not nearly as tall as many of the trees. Therefore, it needs partially filtered or indirect sunlight. A south facing window, or under a tree does the job nicely.
Water
As with almost any container gardening, water when the top of the soil is ever so slightly dry. Another method to check is to weight the plant (pot and all) after watering, and to then water after the weight goes back down. They are very sensitive to chlorinated water, so you are going to want to use rainwater or at least filtered water. If nothing else, leave an open container of water out overnight, so that the chlorine can dissipate.
Fertilizers
An organic fertilizer usually works best. Avoid anything high in nitrogen, as it will prevent flowering and fruit production. Something with a balance of 15-15-15 works well. A lot of people use fish emulsion. Worm tea is supposed to work wonders for the plant.
Soil
Going back to our forest scenario, the soil of a forest is mostly lacking nutrients, except for the top layer. Something like peat and perlite is recommended. I've seen mixes of 50/50 to 60/40 (that's peat to perlite). Spreading a thin layer of well composted material across the top would be beneficial also.
You are going to want acidic soils. So if you do end up buying premixed, or make your own peat/perlite mix, check the pH. It should be around 4.5-5.5. If it is too high, the plant will suffer.
Air
The plant comes from a very humid climate, so a humidity rate of
at least 60% is recommended. If you usually have a low humidity rate, you need to increase the humidity yourself. Some people place a clear bag over the pot, while some place it in a grow tent. If you want to go all out, you can construct a box with clear sides and a plant humidifier.
Temperature
They aren't very cold tolerant above 70° F (21.1° C). Anything around 38° F (3.30° C) on a well establish plant can be lethal to your plant. For younger plants, even 60° F (15.56° C) can be deadly.
Containers
They actually like to be ever so slightly root bound. Choose a pot that is about 2x as large as the root ball (1 gallon is usually the common size). A lot of people avoid plastic, claiming it has side effects. That choice is up to you.
An example of a grow tent for humidity:
That's a summary of what I know. If anyone has any questions, feel free to ask.
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