How Can I Create a Buoyancy Lab for Extra Credit?

[Goopy17]

Homework Statement

Create a lab that proves the buoyant force equation; on a separate sheet of paper

That is the directions

Homework Equations

F = pvg

The Attempt at a Solution

We haven't done anything to do with buoyancy, this is extra credit. I'm not sure what to do.

 

[Spinnor]

https://www.google.com/search?tbm=i...0l0l22052l49l48l0l20l7l0l230l3902l7.15.6l28l0

https://www.google.com/search?hl=en...w.,cf.osb&fp=694e8924650858ea&biw=734&bih=439

http://hyperphysics.phy-astr.gsu.edu/hbase/class/phscilab/dens.html

 

[Goopy17]

So I got that I would have to get the weight above water, and then get the weight when it is submerged in water and the force would equal the weight difference. How do I get the weight underwater?