1. The ghee I have used is very minimal. Since this is "ghee" rice, you can add around 1/2 cup ghee. But if you don't want too much addition to your waistline, then... :)
2. Use pure cow's ghee. You can use vegetable ghee, but nothing can beat the taste of cow's ghee.
3. As for the water, ensure to keep it for boiling at the time you are sauteeing the onions. So by the time the rice is crisp, the water boils and is kept on off mode for sometime. Do not let it cool off - the rice will stick!