Starting with your bare wall studs on your shower walls simply take your plastic sheeting and staple it to the wall studs completely covering the entire surface which will be inside your shower. Although I personally do not use that, it is an acceptable barrier. You can also use tar paper or roofing paper, the thick black paper used under shingles. The preferred material for a vapor barrier would be 4 mil or thicker plastic sheeting which can be purchased at places like Home Depot or any hardware store. You must prevent any moisture from reaching them. While the backerboard will not swell when wet, your wall studs will. To install the backerboard you must have a vapor barrier between it and the wooden wall studs. It will lead to cracking grout, tile, and all sorts of bad things. That just means that when they get wet they do not swell up.
The advantage of cement backerboards is that, while not waterproof, they are dimensionally stable when wet. When installed properly they will give you many, many years of durable shower construction. These materials bridge the gap between expense and effectiveness. Cement backerboards include Hardiebacker, Durock, Fiberboard, wonderboard, and similar products. Installing cement backerboard is one of the more popular choices for a shower wall substrate.
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