Good cyclists are supposed to get used to drinking from a water bottle while riding - even riding no hands and pull stuff out of jersey pockets while riding in traffic. And although I am comfortable doing this, I guess it is not always safe.
Yesterday on the way home I dropped my water bottle as I was putting it back in the holder. This was on McDermott in three lanes of traffic. I quickly pulled off the road to the sidewalk and watched as the cars all drove by and none hit the bottle sitting right in between two lanes of traffic. Once the cars passed I quickly darted out on my bike, grabbed the bottle and back on my way (in 98deg humid weather I will not let the water bottle leave me).