Well, since you asked for household items... I think that just about any oil lubricant will be better than nothing, but if you can make it down to the local Wal Mart, then you might pick up either a can of Remington's RemOil or a can of Sheath (Birchwood Casey, i think). Some of my friends in the airgun world have tested various easily available oils for their rust protection properties, and RemOil came out on top, followed very closely by Sheath.
hth,
Phil Reedy