Subject: How does temperature+different types of salts effect the buoyancy of water?

I am doing an expriment to try and calculate the differences in bouyancy based 
on temperature and addition of various salts.  I was wondering if such a 
difference would be measurable with simple tools such as a homemade over-flow 
container and a spring scale. The salts I am testing are table salt, sea slat 
and epsom salt.  I was also wondering how to calulate the weight of epsom salt 
when added to water. Because it is a hydrate I was confused as whether or not 
to include the hydrated water in the weight. When the salt is dissolvd in water 
I believe the hydrated water will be released and just add more water to the 
mixture. Any information woul be very appreciated. Thank You. 

Re: How does temperature+different types of salts effect the buoyancy of water?