Good water vs Bad water ??

[dipchip2000]

At the risk of sounding totally stupid, I am going to ask anyway. Has anyone ever conducted a study on chemical composition of tap water. When the same variety is grown by different gardeners in different climates we seem to get varied opinions on the taste and quality of the fruits. Everyone gives credit for this to weather. I too believe weather must play a big part in a tomato being excellant flavor in one area and a complete spitter in others. While we always say that (your own taste may vary) I really doubt that taste can be that opposite. While we all grow in our own areas and water as needed in our own amended soils, it would seem that water is the main variable. Could some water have higher PH or lower PH and dissolved minerals,chlorine, or other chemicals in it that are not harmful to us to drink but enough to cause major differences in the taste of the fruit. Obviously the water in the mountains is different from the deserts and any water anywhere is going to absorb some elements from whatever rock or soil type it has filtered through.
Has anyone used rain water only or filtered water only and achieved good results on a consistant basis and with various varieties found to be spitters by others? I know how dumb this sounds but its 4degrees outside and Im just sitting here pondering what is probably a moot point anyway.
ron