Clear quartz can replace any crystal. Rocks and stones can too if you charge them with intention, however they mat not work as well as the actually crystal as they don't have the same natural vibration. But it makes a great quick replacement
rosemary can replace any herb
white and black candles (preferably white) can replace any candle (also replace any color in color associations)
frankincense and copal can replace any gum resin
frankincense can replace any essential oil
tobacco can replace any toxic herb
rose can replace any flower

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Witchcraft basics
SpiritualThis will include information on both witchcraft and paganism. Feel free to ask questions