Hi there i am making a game for android and i want to make a object who must be filled with water or to be draw in game and when the specific action are met to open the door for other rooms. 
Hi!
To open the door when something specific happen - use blueprint communication. Event dispatcher for example - Fire event inside Door_Blueprint and activate Timeline to move Door StaticMesh in proper direction. In fact you can use any Blueprint Communication method. You need 2 Blueprints - Bucket_Blueprint , Door_Blueprint and TriggerVolume to check is Bucket currently in right place to fire Open_Event. If you have many puzzles like this in your game - It’s worth to make template. Documentation ///////// BlueprintComunicationTutorial
To simulate water - apply water material to StaticMesh that represent water volume. Drive height of this StaticMesh
via Timeline. Add particle emitters on edges of your container to simulate filling. Good luck!
Thank you