I move my feet to spin in general, (normally very static) and if im "in" come down the pitch if it's not quite short enough to play back to and not quite pitched up enough to play from the crease. If mid-on.mid-off arent back then go over top till they are or between mid-on and midwicket if pitched on legs, between mid off and cover if outside off.
I generally play positively against spin and attack it, after all you are not going to be beaten for pace, but most likely outwitted so if you don't get carried away and stay focused it's quite easy to score from.
Also use the single to the "back" fielder to keep rotating strike - I generally aim to score 5+ an over against spin every over with 1 or 2 12+ overs
And as 400notout says, if i come down the wicket it doesnt mean im going to try and smash it, it just involves getting to the pitch and if that is not possible either block or push for single