What the heck should i do? Other then purchasing them I know only 2 quest that have Daedra for you to kill and take their hearts. I don't know how, but when I get to his house (some kind of museeum) he just floats around in that water, all dead and what not.

A UESPWiki – Sua fonte de The Elder Scrolls desde 1995 < Skyrim: Quests: Daedric. However I have watched and subscribed to Several TES focus youtubers, Zaric Zhakarion being one example. He sometimes can be tricky to find but he will be in that room. Also if you do the quest in Bright Star that leads you to the museum there you'll have a chance at the end to score 2 Daedra Hearts if you chose to help the owner of the museum. Where can I find Daedra to kill in Skyrim? Two of these Daedric quests involve the reward being a choice between two artifacts, one quest being the 'The Black Star' and the other being 'Ill Met by Moonlight.' The best place to get daedra hearts is at the mages college, in the living quarters there is a guy named Enthir who sell 2 at a time for around 800 gold.

For the Daedra heart, just go to the Shrine of Mehrunes Dagon and there should be Daedras there to kill.

Where to find a daedra in skyrim