Why didn't he bring a bottle of that PED spiked water, get it lab tested and announce the results on a press conference? This would mean jail time for K2 and a huge publicity blow to them. But instead Fury comes home and says he had "reliable sources that K2 -> MIGHT <- want to contaminate his water"? That's just a load of horsesh** and doesn't really reflect well on Fury.
What would have been smart of Fury would be to collect all the water offered to him, pack it into a bag and bring it to the UK for testing in a laboratory. That would have been smart. Running his mouth that he was scared of being poisoned isn't smart. It's incredibly immature.