Depends on your travel style, eating habits etc. Id you stay in a hostel, and don't spend on non veg food and transportaion (given you walk around) then it should be under ₹1000
For one day travel that too solo, cost varies between 3K to 4K. Don’t miss out on Mehrangar
Umaid palace
Mandate garden
Desert rock park
Osian temple town Along with kachori baati, Paanch pani gol gappa and kulfi.
Depends from where you're traveling from. Traveling/Sight seeing in Jodhpur won't cost you much, just use ola/uber/rapidly bikes, they're really cheap. Also the food is reasonably priced too.