Response about zesting.....
About wax on fruit - I usually buy unwaxed or organic but remember the wax is food grade. I guess you could wash it. If you are concerned about chemicals on the food I am assuming that you already used organic produce/products. Lemons aren't usually that much more expensive, though they are sometimes smaller so use more.
I reccomended the zester because you said that you aren't a professional baker and had never zested before and where afraid of it tasting bitter.
The link that you posted is the kind of zester that I used when I went to culinary school. It produces long strands of zest, which you then have to chop up. Frankly I can zest on anything, but I have been doing it for years. The above tool is grate if you want to do decoration work or candied zest etc...A lot of bartenders use it.
The zest is "deeper" so could be a bit bitter. Also it takes practice and control to really get good zest and to utilize the whole lemon. Then of course you have chop it up, and (I find) that the little bits never quite disolve and that you will find little nibbles in the bread (which you may want).
I guess I should have used the term "microplane"
http://www.amazon.com/Microplane-40020-Grater-Zester
If you don't like zesters/microplanes than use a cheese grater, on the smallest hole and with a VERY light hand.
Happy Baking