[Drewit]

Ignoring the robot, people, and the driver station, the five things that I believe are necessary for our pit are (in no particular order):

• Toolboxes - All FRC robots require some degree of maintenance, so a toolbox full of tools relevant to the robot and organized for easy retrieval is essential. Having the toolboxes be rolling toolboxes make loading/unloading easy. Ours are currently COTS (and painted to match team colors), but others like Team 1619, Team 365, and Team 973, have custom toolboxes.
  
• Safety Supplies/Strategies - Sometimes overlooked, safety supplies are a necessity to ensure injuries get treated quickly before they worsen, and safety strategies (i.e. making sure nobody is in the robot before enabling, making sure people won't get hit by moving robot parts, securing controllers before enabling, disabling the robot if someone does something unexpected that puts them in harms way, etc.) help to prevent injuries before they happen. A first aid kit, battery spill kit, and some safety strategies are a must at minimum.
  
• Spare Parts - FIRST is a contact sport, and I am a believer in the full version of Murphy's Law: Anything bad that can happen will happen at the worst possible moment. Things are going to break, so it's important to plan ahead and bring any spares you believe will be necessary while respecting the rules for spare parts allowances.
  
• Batteries and Chargers - FRC batteries deplete rather quickly, so having charged batteries on standby helps ensure pits run smoothly. We currently bring our batteries and chargers in totes, but other teams like 1619 (see link above) and 973 (see link above) have dedicated carts for battery and charger storage.
  
• Sponsor Recognition - FRC is not cheap, and it takes a lot of sponsors to fund a FRC team, so thanking them for their support is extremely important! In our pit, we do this in two ways: Having a dedicated sponsor banner in the back of the pit up at the 10ft limit, and/or having a computer and monitor run digital sign software (we use Xibo) that cycles through photo/video libraries with the sponsor library playing multiple times during a cycle.

Note: My comments are my own and may not represent the teams that I am involved with.