as others have said - the basics are where to start - some duct tape, antifreeze, basic small tool kit

Other CHEAP things to add - a roll of toilet paper (I'm serious) in a ziplock bag, a few rags/towels, a package of baby wipes(yeah, even for you single guys), at least 2 L of POTABLE water - and in winter - thow a spare wool blanket in the car

Other than the blanket - I think I added about $5-7 to your list