is there any product made to hang curtain rods without drilling holes?
yes you can
as matter of fact i have about two of them
http://www.shop.com/+-a-sping+loaded+shower+rod-p32880091-k36-st.shtml
buy this one you wont regret it. it not actually spring loaded tension and all you got ot do is twist it
Curtains
$6
Curtains – Janet