Hamsters are omnivorous, which means they eat both vegetables and meat. Their natural foods include grains, seeds, vegetables, and insects, and they will like corn, oats, or wheat mixed with dry dog food. Premixed hamster food from a pet store has complete nutrition, but some hamsters won't eat it.

Either feed the hamster at the same time each day or leave a constant food supply. Hamsters will not overeat but will often store food in their cheek pouches and put it in a hiding place to eat later. Remove food that is no longer fresh each day, and clean out the "hidden" food once a week. Put food in heavy ceramic or plastic food dishes (so they won't tip over) and clean them weekly.

Bedding:

No cedar or pine!! Both contain oils called phenols that cause liver and kidney failure, a long term, slow process that will shorten the animal’s life. Acceptable bedding include, shredded aspen, and CareFRESH™ (a paper product). Gentle Touch™, a pelted aspen product, is very good at odor control. It can be used as a base for the bedding, followed by a layer of bedding.
Thin shredded aspen is very good nesting material that is easy to dig holes in that stay. When your hamster is pregnant do not use fluff, which is easy to get stuck on, or have babies loose limbs. Use toilet paper as a nest that will protect the babies

Water should be available at all times in a gravity fed water bottle. These are available at any pet store. A dish of water will only get spilled or walked in, getting both hamster and bedding wet. Water bottle holders are also available that come with chew guards and caps to prevent destroyed water bottles.