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If you want, you can burn some Kyphi Incense. It was THE traditional sacrifice to almost every God in Ancient Egypt.
Google Kyphi and you will find many recipes how to produces it yourself or you can buy it already mixed on Amazon or Ebay.
Only thing you have to watch is that the Kyphi is burned after the sun has complety gone down, since Kyphi is traditionally only burned at the end of the day and Ammit is the goddess of the second night hour.