What kind of cactus is this and what's wrong with him? I got him at the farmer's market and he didn't have a tab that says what conditions or how often you should water. I spray him with water once a week but some of the leaves have wilted and turned orangish reddish. Am I watering too much or is there anything I can do to save him?
No idea on the name but i can confidently say - water once a week is a rough guide. You should use your index finger to poke into the soil and water thoroughly (let the soil soak up as much water as it can and drain off the excess) if the soil is dry. Succulents do not need constant watering.
From my devastating experience of drowning my Kalanchoe plant.
Although you can't see the top of the plant very well it does look like one of the echevarias.