Final answer:
When draining oil from an oil pot, the bucket should contain nothing to prevent contamination and ensure safe disposal. Adding other substances can create unsafe conditions or complicate the disposal process.
Step-by-step explanation:
When removing oil from an oil pot, the bucket that the oil is draining into should contain nothing. It is important during the oil removal process to ensure that only oil is collected to prevent contamination, allowing for safe disposal or recycling according to local environmental regulations. Adding any other substance such as water, more oil, or pure ammonia can lead to unsafe conditions, negative chemical reactions, or difficulties in processing the waste oil.