For a watertight seal on your windows, nothing beats reglazing with oil-based glazing compounds. Clean out the loose debris and make sure that the push points holding the glass are firm. Prime any bare wood. Then knead the putty for a minute and roll it between your palms. Use a good stiff putty knife to flatten the bead on the surface. Your motion should be quick and smooth and always in the same direction.
Window security can be as expensive, or inexpensive, as you want. Although specific security bolts are designed for windows (see facing page), regular bolts, while a little less convenient, work just as well to keep the windows shut. Also, on sliding patio doors, you can block the sliding door by wedging a board between the inside door panel and the jamb to lock the door closed.
Clear plastic sheeting inside a window is an inexpensive alternative to a storm window. It's easy to install, too. Just stretch the plastic sheet over the window and secure it with tape, tacks, or nails.