De todos modos, los bricolajeros sabrán hacerlo, es sencillo. Dos detalles: pintar el interior de la caja en negro, usar unas bandejas de vidrio para contener el agua, y usar un tubo que no deje sabor en el agua (recomiendan hervir un trozo del tubo en el agua y tomar un sorbo, a ver si deja gusto o no). 
We chose to paint the inside black and use two large glass baking pans to hold the water. Glass baking pans are a safe, inexpensive container for dirty or salty water, and they can easily be removed for cleaning. We used two 10 x 15" pans, which hold up to 8 quarts of water when full. To increase the capacity of the still, just increase the size of the wooden box and add more pans.
The operation of the distiller is simple. As the temperature inside the box rises, water in the pans heats up and evaporates, rising up to the angled glass, where it slowly runs down to the collector tube and then out to a container.
The runoff tube is made from 1" PEX tubing. Stainless steel can also be used. However, use caution with other materials—if in doubt, boil a piece of the material in tap water for 10 minutes, then taste the water after it cools to see if it added any flavor. If it did, don’t use it.
Turn undrinkable water into pure, crystal-clear distilled water with a home-built solar still.
View step-by-step photos of how to make a solar still in the Image Gallery as well as this PDF of the DIY Solar Still Plans.
1. Mark and cut the plywood pieces according to the cutting list. Cut the angled end pieces with a circular saw or tablesaw set to a 9 degree angle.
2. Cut the insulation the same size as the plywood base, then screw both to the 2 x 4 supports with 2 1/2" screws.
3. Screw the first layer of front and side pieces to the base and to each other, then add the back piece. Predrill the screws with a countersink bit.
4. Glue and screw the remaining front and side pieces on, using clamps to hold them together as you predrill and screw. Use 1 1/4" screws to laminate the pieces together and 2" screws to join the corners.
5. Glue and screw the hinged door pieces together, aligning the bottom and side edges, then set the door in position and screw on the hinges. Add a pull or knob at the center.
6. Paint the inside of the box with black high-temperature paint. Cover the back and the door with reflective foil glued with contact cement. Let the paint dry for several days so that all the solvents evaporate off.
7. Apply weatherseal around the edges of the hinged door to make the door airtight.
8. Drill a hole for the PEX drain. The top of the PEX is 1/2" down from the top edge. Clamp a scrap piece to the inside so the drill bit doesn’t splinter the wood when it goes through.
9. Mark the first 19" of PEX, then cut it in half with a utility knife. Score it lightly at first to establish the cut lines.
10. Drill three 1/8" holes in the side of the PEX for screws, then insert the PEX through the hole. Butt it tight against the other side, then screw it in place, sloping it about 1/4".
11. Wipe a thick bead of silicone caulk along the top edge of the PEX to seal it against the plywood.
12. Shim the box level and tack a temporary stop to the top edge to make it easy to place the glass without smearing the caulk. Spread a generous bead of caulk on all the edges, then lay the glass in place. Tape it down around the edges with painter’s tape, then let it set up overnight.
Aquí las imágenes...
http://www.motherearthnews.com/multimed ... 7252&seq=1" onclick="window.open(this.href);return false;
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Aquí el plano:
[pdf]http://www.motherearthnews.com/uploaded ... 20Plan.pdf[/pdf]