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Hydrometers to measure the specific gravity of urine are unimaginatively called "urinometers",they can cost as little as $10 ...http://www.esportshealth.com/shop/product.asp?catalog_name=School+Health&category_name=Screening+and+Diagnostic+Devices&product_id=UrinometerThe presence of water and detergent in the container can affect results, so make sure it is clean and dry before adding urine.
BUT your theory about the importance of minerals to circulation is completely implausible in terms of very well understood physics (which also explains without difficulty the observations of the Brixham Cliffs and other experiments). If you are planning to produce a paper, and genuinely wish it to be taken seriously and have a chance of providing the enhanced quality of life you believe it capable of, you will be more successful if you limit yourselves to the empirical data and don't try to push your theories too hard, at least until you've made an impact with the IBT.
Andrew, what process do you go through to deduce that 5 degree's was the right height to sleep at?