I'm a bit late to the party here & probably not much help at this point, but even without a hydrometer or refractometer, if you read the instructions that are usually printed on the bucket of salt, they will give you a ratio of cups of salt to gallons of water to get you fairly close to the desired salinity....
http://www.canreef.com/vbulletin/sho...hreadid=119214
Relax, take a break & slow down... it takes time to get a salt water tank going.