Depends on the time of year.
In the summer, cold brew coffee. For breakfast, orange juice.
I hardly ever drink sugary sodas so don't dedicate fridge space to them. I sometimes like a beer of an evening but there's no single staple - I like craft beer and rotate what I drink. In the winter I'm more likely to drink the heavy Belgian quads and imperial stouts but in the summer I usually want something a bit lighter - something like a session beer even if I only drink one of them.