Sure, just wanted to add a data point about food poisoning yourself with tea.
Colloquially, "food poisoning" refers exclusively to (per Wikipedia) "Foodborne illness (also foodborne disease and food poisoning); any illness resulting from the spoilage of contaminated food by pathogenic bacteria, viruses, or parasites."
You might want to use water with high level of iron though. My grandfather used to use arsenic to brew cider because its local water had really high levels of iron.