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Everyday chemicals can be used for labs; using the environment around your school (grade level?) can bring in ecology, biology, geology, and if you are close to water, many different science concepts.
You can also utilize your parents, PTO, etc., to help supply materials. Mason jars can be used instead of beakers, egg cartoons for so many different things, I use the cardboard cartons to start plants, styrofoam as wells for chemical reactions (not readily available anymore and as long as the reactions don't interact negatively with the styrofoam), local organizations like BLM, USGS, Extension offices, and town/county government agencies have data that students can use and then determine how to connect. I have used simple garden soil sampling kits for N, P, K, and pH. Extension offices often have soil and water testing kits for homes that they may make available for your students.
Hope this gives you some ideas.
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