Where Can I Find a Large Concave Mirror for Heating Water?

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To heat a bottle's worth of water, using a concave mirror to focus sunlight onto a heater core is a proposed method. Difficulty in sourcing a large concave mirror has led to the consideration of using a satellite dish. The challenge with the satellite dish is achieving a shiny surface for effective heat concentration. An alternative suggestion is to utilize giant Fresnel lenses, which are available from Edmund Scientific, specifically designed for this purpose. Exploring these options can enhance the efficiency of solar heating for water.
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Im trying to figure out the best way to heat a about a bottles worth of water, my idea was to get a concave mirror and focus it onto some small radiator like a heater core. The thing is I can't find a large concave mirror, so I was thinking about using a satalite dish but I can't think of a way to make it shiny enough, you guys go any ideas?
 
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Edmund scientific sells giant Fresnel lenses just for this purpose.
 

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