Front brake only question: both levers to 1 caliper?

[cheapvega]

Do you always drink with your left hand? If not, that could have an impact on when you get to drink, especially if you're in a bigger city. Even with two brakes, I still chose my moments to hydrate carefully when I lived in London.

The roads I ride on are relatively empty and calm. It's not hard to find an empty stretch for a drink/gel pack.