Will you be leaving the GHB at work, or carrying it to and fro every day? If you are leaving it at work, you should find a secure place, or when you need it, you may find bits and pieces have walked away. If going back and forth with it every day, I wonder if your GHB might be getting a bit heavy.

If it is secure and at work, you may want to create a "commute kit" that is pared down, but enough for the more common problems, e.g., it wasn't supposed to rain, but it is...etc.

Making route surveys is a great idea, maybe both walking and cycling. Make note of places--stores, offices, public buildings etc., that you can duck into if necessary, even if it is only a lobby of an office building.