Is dry cleaning a expense you can afford at this point? As satin is VERY hard to remove water spots once they are dry.
If they are not dry yet you can take a paper towel and rub in circular motions and it will remove the water.
If not you can take a wash cloth get it damp and in circular motion rub the stain, then get your paper towel and rub in a circular motion until dry.
If that will not remove it then dry cleaning is your only option at this point.