That depends a lot on your availability to participate in preparation. Other commenters have mentioned yaupon. I'd bet you have camellias growing locally as wel

That depends a lot on your availability to participate in preparation. Other commenters have mentioned yaupon. I'd bet you have camellias growing locally as well. Commercial tea comes from camellia sinensis, but can also be made from other camellias. If harvesting and preparing isn't your thing, there is some tea that is grown and sold in the US. Not much to choose from, but it's available. If it's not obvious, I've been giving this some thought for a while. I've homeroasted coffee and discovered that I enjoyed the process more than the quality of the outcome. Coffee won't grow well where I live, but camellia does great, and that would give me the opportunity to take on the entire process from root to cup and truly seize the means of my own caffeination.