Some items that can be made with no or minimal sewing-

As already mentioned, check the DIY section of this site, glued tarps/tents, and pot cozies.

Hammocks-Google Risk's site.

Stoves: Alcohol, Esbit, wood.

Windscreens

DIY pot from cans

Stakes, knives, utensils, trowels

Fleece poncho or blanket (Fleece doesn't fray, so edges need not be finished)