Obtain a bowl or vase. Usually the bigger the better. I recommend around 1/2 gallon or larger. Craft stores or large retailers tend to have a pretty good selection but even a large pickle jar can be made to look nice. Put about an inch of sand or gravel on the bottom. While not absolutely necessary it serves several purposes. aesthetic value a substrate of sand or gravel will help harbor needed beneficial bacteria which eat harmful toxins such as ammonia, nitrite and nitrate. Help hold down any plants you wish to at to your tank or bowl. a sand - trumpet snail combination will aid in breaking down and removing un eaten food and waste. Clean the bowl and gravel by flushing with water several times to make sure any excesses dirt is removed especially from the sand or gravel. Don't use any commercial cleansers for this, lingering traces of any chemicals such as soaps or disinfectants could prove toxic to the future inhabitants. Just plain tap water will do. When your satisfied your bowl in clean, fill with tap water and then let sit for 3-4 days to allow any residual chorine in the water to dissipate. during this waiting period you can add plants. Add any other inhabitants to your bowl you deem appropriate. Periodic Care - Basically there are two forms of periodic care that need to take place in your Globe or Vase. Partial water changes and feeding .