I'm doing research and I want to now what dogs can eat an drink

Dog chow and water for starters and if they have been really good then fillet steak and champagne.

You might refine your question to what is best for dogs to eat or drink. In my experinecs dogs will eat almost anything and everything including shoes, belts, computer cables, and the bottons on my car radio. They can drink soiled water from a toilet or from a farm stream. Now of this is good for them but they can do it. The joke goes why did my dog eat my slipper. Answer: because he can. This may help get your research going in a better direction http://www.petalia.com.au/templates/storytemplate_process.cfm?story_no=257