You probably shouldn't have done that especially with the water that cantained the dead animals.
What I ususally do is to fill a small bucket with a quart of tank water and put the animals in. Then I slowly drip tank water directly into the bucket using an airline tubing with a small valve that controls the drip rate. I would let about a gallon or so of DT water into the bucket over 45-60 min so at least the animals will be at room temp. I then use a pair of tweezers and start putting the live animals into the DT one by one. That way I know which ones are dead so I can claim credit later. I never let the water in the shipping bags enter my DT tank.