you could staple it to a long bit of wood, then put the end of the post in a flower pot full of concrete.

you can probably tell i have no idea about this kind of stuff

You know, mgl, I was thinking something along the lines of what flopsy described with the obligatory disclaimer that I'm not a construction enthusiast, just a life long renter, so my brainstorms aren't exactly elegant designs so much as quick fixes with the emphasis of being entirely reversible and on the cheap.

Obviously I don't know what your stoop looks like, but it seems you could anchor (nail, staple) the Visqueen to a long 2x4, roll it a few times to make sure it's secure and attach the wrapped wood to the roof and the bottom base of the stoop with brackets. If the stoop/porch floor is stone or concrete, you could use concrete blocks to sort of bookend it or wedge it. Hell, you could get several and make a little smoking seat. You could also get some of that foam weather stripping and put it between the 2x4 and the brick to reduce the breeze through the mortar grooves.

Yeah, seems to me you'd have to build a full frame for the window and anchor at top and bottom. You could then use foam rather than caulk to seal it against the brick. Not perfect, but then your plastic windows won't provide much besides draft protection anyway.

You may want to consider how you could build permanent storm windows for the porch, as long as you're going to this effort.

Drat. Thanks for the input - y'all are right, I have to think in terms of not sticking stuff to brick, and the tall 2 x 4 is the only answer. I was so hoping someone would say, go to Home Depot and buy mystery product X for $3 and it will stick to brick! But alas, nothing sticks to brick. Sigh. Well, off to get a 2 x 4.