Do you warm your babies bottles or use room temp water? why/why not?

[MummaBee]

I warm the bottle because I find the formula doesn't clump that way, also because the warm milk seems to help her go to sleep. I basically fill the jug first thing in the morning then everytime i go to use it switch the jug on to boil then once its warm enough put it in the bottle then add the formula, actually im the only one I know that does it this way but if im going out I boil it and leave it in the nappy bag to cool .

Oh the science of bottle making