In addition to what most people have said I like to have:
- Screwdriver and Hammer (mostly for threatening people, just kidding, sort of)
- All kinds of glue (gorilla, super, clear, stick)
- Flashlight, and other lights.
- Small speakers
- My personal headset for when they have the giant scary ones that kill your ears.
And then a bunch of other stuff I just think is fun, or entertaining, or potentially randomly useful but not which you would need in a beginning kit.
Matthew - I completely understand your philosophy on hiring the person not the tools and 100% agree in the case of pro situations, but what about amateur companies? I'm not sure about in the States, but here SM budgets on amateur productions are sub-zero; we're expected to provide what we need, and then some. Is it better to fight for a policy change and get a cut of the budget, or should we suck it up and provide equipment including some consumables?
But ultimately, it's about it's what you feel comfortable with and if it makes your job easier. We have the same issue here for amateur theater. To be honest, I am trying to lead a small rebellion about stage management and low paying jobs - so I am probably not the best person to ask about - I am wishing for better working conditions for stage managers across the board. And truly wish that supplies were provided for you everyone.
I'm of the same mindset, I show up to most gigs with a pen, pencil, laptop, some post-its and a question about how expenses are handled. Companies of all sizes should be able to cover our basic needs, especially when we know how much is not going to our salary, our supplies are not that expensive.