You don't say whether it is BWI or BWV. BWI water view is unlikely, but possible for some rooms, to give you Epcot view as it is either a view over the boardwalk (which faces more toward MGM on that side of the resort and you really cannot see Illuminations), the BWI quiet pool ( and only limited number of rooms there, higher floor, one side, can see Epcot), or the canal going to Epcot from which you can see Epcot but it is not that many rooms. Many garden view rooms face Epcot wholly or partly but then many do not.
BWV side, only water view rooms that face Epcot are those overlooking the boardwalk and that makes up only about 15% of the resort.