Choosing bottles

My baby will be six months in a few weeks, meaning it's time to introduce food and I guess also water and maybe some unsweetened juices? Anyway, I thought I needed to get a bottle and I'm so confused as in what to get! He's been exclusively breastfed. Has never had a bottle and no pacifier, so I guess it would be easier to start with a feeding bottle? Or should I still get a sippy cup? Should I go for a latex or silicone "nipple" for the bottles? How big should the bottle be? I've seen both 150 ml and 300 ml. Can you buy a bottle where you can change the top, say I get a sippy bottle and it doesn't work, can I just buy a feeding bottle top or do I have to get a new bottle? It's a jungle! The only thing I know for sure is that I want one with handles, but feeding bottles with handles are so hard to find, I've only found sippy cups with handles. I'm leaning towards getting a NUK anti-colic sippy as it has handles and seems great but I'm really clueless. Please help!