Being in the health care industry, it makes sense that powdered formula carries the risk, due to being unable to sterilize powdered substances. And as a side note, bottled water is not sterile and should be boiled before using to prepare infant formula.
I have chosen to use the sterile concentrated liquid to avoid all the issues and make a batch using sterile equipment and sterilized bottles/nipples, and refrigerate 24 hrs worth of feeds in order to reduce the risk to my newborn. I was actually surprised when I did the math and found that a serving of the concentrated formula is actually 4 cents cheaper than a serving of powdered formula for the brand I use.
Just my 2 cents!! :-)

ive never heard that. but i use the bottled nursery water anyway. theres no way i would use our tap water. i dont even like drinking it myself. besides, who the heck wants to to wait that long to feed the baby esp in the wee hours of the morning.

i use nursery water and i put water in all the bottles then just add powder formula as i need it but i dont heat his bottles either he takes them room temperature