I have started raw feeding

& now my pet hardly drinks any water

The moisture content of a raw diet is variable, but is usually greater than 70%. Dry pet food (biscuits / kibble) is only around 10%. 

If you have changed your cat or dog to a raw diet from one that includes dry food, they will have increased their water intake significantly via their food alone. It is normal for pets on raw to spend less time drinking from their water bowl. If they are healthy and energetic, with normal toileting habits, than it is not a cause for concern.

If they seem unwell, or if you notice unusual toileting behaviour (such as passing urine more often, or in inappropriate places), get them checked by your vet.

Cats in particular benefit from having more moisture in their diet. They do not have a high thirst drive, and struggle to drink enough water on a dry diet. There is evidence to suggest that dry diets are a causal factor in urinary tract diseases.