hmm I agree now may be a good time to toss the dummy. IMO after this long he may not even know why he is so upset (water/computer) & mostly upset because you took the puppy & dumy away.
I would say go sit with him, or better yet bring him out & show him what he did, don't get angry with him again. Just say look what you did with the water, this is not a good thing to do. It might be broken now (if your not sure it is). I have your Puppy here & if you can say you are sorry you can have him back. Or maybe even settle for a cuddle. Be a little flexible, after all he is only 2. But I wouldn't hold out on the puppy for a sorry for too long.
If he asks for the dummy just say sorry mate, its broken like the computer. But here you go, here is pUppy.

Count to 10, I so know what it slike to find that sort of thing has gone on when you are tied up with another little one.