Water dispensers

For a long time, I had Sparkletts delivering bottled water to my house for use in a Sparkletts-supplied dispenser. At $17 a month rental on the dispenser, I figured I would save a lot of money in the long run by canceling the rental and getting my own dispenser.
However, I've now bought three different dispensers -- two from Frys Electronics, one from Sears -- and all of them put out very bad tasting water, despite precise attention to pre-use cleaning and preparation as outlined in the owner's manuals. It's a very strong plastic taste that is not present in the water prior to being introduced into the dispenser. I have been meticulous in the prep, yet the problem persists through three different brands. (In each case, btw, when I returned the item, I learned that I was not the first to complain about the problem.)
Can anyone recommend a water dispenser that absolutely doesn't have this issue, or suggest what I might be doing wrong? (Despite the repeated problem with different brands and my own general belief that the common denominator -- in this case, me -- is often at the root of a problem, I'm strongly unconvinced that I'm at fault here. But I'm willing to listen.)
Jim Beaver
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WHen I installed my RO filter, there was an initial plastic-ey taste to the water. Took about a week of purging to get rid of it for my taste and another 2 weeks of purging to get it to my wifes satisfaction (she can smell things nobody else can). WHen I changed the dispenser, the taste returned but quickly faded . We learned to run the water for the time it took to purge the tap.

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