There are many ways to express that you are not feeling well today. Here are some alternatives to "I am not well today":
- "I'm feeling under the weather today."
- "I'm not feeling my best today."
- "I'm a bit off today."
- "I'm feeling a little unwell today."
- "I'm not in top form today."
- "I'm experiencing some discomfort today."
- "I'm feeling a bit sick today."
- "I'm not up to par today."
- "I'm not feeling 100% today."
- "I'm not in the best shape today."
Choose the one that best fits your personal style and the context of the conversation.