A very easy way to do this is to sink a child's wading pool with
the rim just below the soil surface, and fill it with a peat-sand mix.
Maintain moisture with a drip hose.
If she means "10 feet square", a similar arrangement can be made
with heavy black plastic. But I'd try the wading pool first.
Most descriptions of installed bogs recommend a few holes in the
liner for drainage. I'd guess that Maria has sandy soil -- in which case
the amount wicking over the sides of the liner may be sufficiant.
I'd love to hear descriptions of CP bogs others have installed.
Loren Russell, Corvallis, Oregon