Be sure to include at least the equipment necessary for handling activities listed on the label of the pesticide you are currently using. Cleanup personnel should put on their PPE before trying to contend with the spill or leak. Also in your kit, you should have plenty of hydrated lime, kitty litter, or clay to adsorb the spill. Next, you will need a solution to help decontaminate the area. Refer to the label to make the decontamination solution.
Some labels call for a household bleach or another sodium hypochlorite to be mixed with water.
This solution will not neutralize all chemicals on the market today, so some chemical labels suggest other solutions as practical decontaminants. Finally, you need to have on hand shovels and plastic, sealable barrels to collect the spill and contaminated adsorbent. There are several steps involved in dealing correctly and efficiently with a chemical spill. Stop the leak. Stop the leak and place any remaining chemical in an undamaged, marked container.