You could look up crystal correspondents to find crystals associated with each element. You could also do it by color (red stones for fire, brown for earth, etc.)
You could also paint the alchemical symbols for the elements on stones if you just want a symbolic representation of them.
If you believe in elemental spirits, you could work with those spirits in your practice without necessarily having actual fire or whatever.
Also, you don't have to have incense for air and candles for fire or anything like that. You can get some dirt for earth, a feather or fan for air, and a cup for water. Fire is a little difficult (not sure if you can light candles), but maybe using a hot food or spice, like chili peppers or cayenne?
There are so many ways you can incorporate the elements into your practice. Such as using fire to burn herbs or to light candles for offerings and for spells and also using the fire's smoke for cleansing. As for earth using herbs and plants as well as burying an item you wish to be cleansed by the earth into the ground.
Not really sure about water and air, however, using seashells and sand can be helpful depending on the spell and making moon water is amazing for spells, cleansing, and even for scrying.
Hello Celestialsa, crystals can most certainly be used for elemental magick. Quart crystals would be a versatile option instead of separate types of crystals for each element. I recommend charging your crystals with elemental energy then incorporating them into your magick. Cleansing the crystals before you charge them is especially of importance with quart crystals. For these recommendations pick and choose what works for you. The element of earth can be captured by planting your crystals in the garden or near a tree. Hang the crystals from a branch and play music to contain the element of air. To capture the element of water let your crystal bathe in the moonlight in a natural body of water. Last but not least, for the element of fire have the crystals spend time near a live fire then once extinguished let them sit in the ashes overnight. Don't forgot your greatest asset ... the crystals themselves. Let them help you by communicating what type of element you'd like them to absorb for you x.
wow. thank you all for your answers. unfortunately I cannot use crystals and I live in a urban area (much to my disgust) I have heard that you need spring water for Magick as tap water has been tampered with, is this true?
That kind of depends on your personal beliefs. I've heard of people who refuse to use anything that has been chemically treated in their practice, but there are plenty of people who do. I live in a rural area, so the water I get is untreated, but if I lived in an urban area, I would just use tap water, personally.
If your tradition calls for spring water you could get bottled water, maybe.