I bottle fed my first baby from about 1 month old....I asked a GP friend for her advice (who was also bottle feeding her first born). We both did the following:
Washed & sterilised 10 or so bottles
Filled them with required amount of freshly boiled water (eg 4oz or so for a new born)
Left them, with lids on, on the kitchen work top for maximum of 24hours (after which the water got thrown away & the bottles sterilised again).
When I needed a bottle, I put in the required amount of powder, shook bottle, and reheated in a bottle warmer (you could just as well do it in a microwave, use bpa-free bottles though).
I think they now mutter on about making up bottles from scratch because the formula powder might not be sterile and the only way to kill any bacteria in the powder is to mix with boiling water straight away (not cold water then reheat to baby-drinking temp). Personally, I think this new advice is, yet again, slight hysteria (and like you say, probably designed to discourage people from bottle feeding).
People have been using formula for years (it was all the rage when I was born in the 70's & i've never suffered from being bottle fed!) & I'm sure it is ALOT more clean / sterile / free from nasties than it was back in the 70's. The powder will have to have been steriled before it is packaged... we dont all boil our milk for our cuppa's just in case any more nasty bacteria has crept in since the pasteurization process.
Good luck with whatever you decide to do.... So far I've fully bottle fed one baby (1st born) & fully breast fed the 2nd born & both seem to have been identical in terms of coughs / colds / tum bugs / baby eczema. Even though I plan to breastfeed my 3rd, the BF propaganda drives me mad & I agree that everything DOES seem to try and discourage people from bottle feeding which, in my opinion, just isnt right & fair.