To have right things at the right time at the right place is one of the cornerstones of productivity.

Here are couple examples how I do it:
I need to take my pills daily. I now have pill at every place where I can be in the time when I need to take them or where I may get reminded to take them.
For example:
next to my toothbrush (reminds me to take them in the morning and before I go to bed)
at my office table (when I go early to work I tend to forget taking pills at home)
in my bag (when I travel)
in my car (just in case I get stuck somewhere)
in my travel hygiene bag (just in case we travel, not to forget them while packing)
if all above doesn’t work I go home and find them in my kitchen drawer 🙂

Similar thing I have with pens as I love taking notes and thinking on paper.
I buy pens in bulk and then have them everywhere. One always in my pants pocket.
In my bag I have 4 of them, just in case I lose one, I still have 3 left.

Notebook charging cable – I have one at home, one in the office, one in my bag.
Charging cable for mobile – home, in the office, in my pc bag and one in my car.

I do realize this can’t be done with everything but if it can be I will do it.
Even small things can ruin your day and your productivity and if I can avoid this by having spare cable with me or in my car I definitely will.