Watermist you don't actually need any tools or even an alter. Tools are useful because they help us to focus our energies. You can for example use your finger in place of a wand or Athame. A cauldron can be anything (but please make sure it's flameproof). A chalice can be a wine glass. Whatever tools you use it's best to consecrate them.
In place of/ or in addition to an alter you can use markers for the four cardinal points earth (north), air(east), fire(south) and water (west). A bowl of salt can represent earth, incense for Air, and a red candle for Fire.