Just in case you don't already know, tomorrow is a fast day: Ta'anit Esther (The fast of Esther). Because Purim falls on motzei Shabbos (Saturday night) and Sunday this year, the fast is pushed forward to the Thursday before.
The fast tomorrow is from sunrise to sunset. Normally, the fast would end after the Megillah reading at the beginning of Purim.
For tips on things you can do today to improve your fast tomorrow, check out Tips to Ensure an Easier Fast!