I always like to make sure I can see and be seen when biking because the biker is always going to get hurt even if it isn't your fault. I did the clip on rectangular mirror you can attach to your glasses or visor of your helmet. The mirror is large enough for me to see day or night and I like I can see behind me as my head turns.
I have 3 bottle cages on my Radrover and a 4th on my topeak rack bag. It is way safer and easier for me to use my Camelbak Rogue hydration pack to drink from on the go.
Camelbak Rogue, Amazon, $55:
https://www.amazon.com/Camelbak-201...1496948536&sr=1-11&keywords=camelbak+backpack
I also have a Camelbak 72 oz water bladder I can insert into my Osprey commuter back pack in the laptop pocket when I work commute.