Carl Kind of yes but it goes away eventually.
Leave the Bladder full of water and lid open hanging somewhere for a few days then replace water and do it again (drain water through the hose) do this three times and use fresh water before you go off, you should be good to go. Please remember that water through the taps have chemicals in them which do manifest themselves once the water has been left for a while these congregate at the bottom near the hose outlet…
Ive got an 1.5 Osprey in my motorbike jacket, a chinese 3l and a Source 3l in my long hikes backpack and a 2l KWay in my day pack.
I don’t notice any differences now between them.
I trust the Chinese and Source 3l one the least and only use one of the two at a time. If it breaks then I have a replacement in place rather than be stranded without the ability to store water. And yes taking a Condom means that you can make any container waterproof (eg a long sleeve torn off of a shirt) try to find one with a water based or no lubricant Ive had to learn this the hard way.