Your hamster will need a few essentials to keep them happy and healthy:
A water bowl should always be supplied for your hamster; a bottle or a bowl is fine, although some hamsters may prefer one over the other. The water should always be changed on a daily basis to keep it fresh and cool.
A wheel- Hamsters can run up to 8 miles a night and so need a wheel to use up this amount of energy. Barred wheels should be avoided as they can cause injuries to your hamster's tail, feet and legs. The 'Wodent Wheel' is a good example of a safe wheel for a hamster. If you are keeping a pair of dwarfs then always supply one wheel per hamster to avoid fighting.