Yes, I carry the small bottles with me so that I can take one with me wherever I am going so as not to be without water. Its not easy carting a 2 litre bottle round and the small bottles allow you to hold and drink from them while driving too. I think I drink more water because I use the small bottles than if I had to keep going and getting the larger bottle from the fridge.
YES!!! Totally!! Used to keep a big 2 litre bottle on my desk at work and try to have it gone by lunchbreak but now I just have 4 smaller bottles in the fridge and seem to fly through them!