Bonsai trees have so little soil that they need watering daily or even more often in hot weather. Their real 'home' is in the mountains of Japan where the conditions are very harsh and the only foothold a tree might have is in a crevice in the rock. Although there may not be much actual rain, the air is often damp with mist, so the moisture they need is usually there.
Creating and maintaining a Bonsai involves loving care over many years. In order to make it look like a miniature of its species, one has to prune the roots regularly and, because of its small root system, it needs frequent water.
Usually a spray from a bottle two or three times a day to keep it moist is enough. In hot sunshine it should be shaded. It should be possible to leave it outside in the winter, but that would depend on the plant.
I'm not sure what you mean by a 'Jupiter' tree - I think you may mean Juniper. These are very good, slow growing trees for Bonsai, since their natural habitat is rocky places. If yours has gone dry, try a few weeks of 'misty' weather ... keep the compost moist (but not wet). They are very hardy and can stand a day or so of drying out now and again, if they have to.
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