No, the reason the soil is drying daily is because you are only 'misting it a bit'. Misting is not a substitute for actually watering your tree. By misting like this you are never actually wetting the soil thoroughly so it dries out much sooner than if it were watered properly.Well just about every day, the soil around the root ball looks a bit dry, so I mist it a bit. Is this okay?
Read the sticky thread about general growing tips for a description of watering. In a nutshell, always water thoroughly, to the point of saturation then do not water again until the tree requires it, never on a schedule. Even in the winter you should follow this pattern it will just take longer before you need to water again.
You mentioned that you have already re-potted but you have not described the type of soil you used. Junipers dislike being in heavy, water retentive soil. Mine is happy in an almost completely, as in 95%, inorganic mix, no peat, no potting soil, just a little bark. Hopefully you and your friend researched bonsai soils before you jumped into this.