Eating Before Davening

Shacharit

1. If one slept and woke up after Chatzot it’s preferable not to eat before Davening unless there’s a need, however drinking is permissible until Olot HaShachar.
2. It’s forbidden to eat a KeBeytzah of bread or Pas HaBah Bekisnin or to drink an intoxicating drink after a half hour prior to Olot HaShachar. If one began before this, one may continue until Olot HaShachar.
3. In the morning before a fast day some are lenient to allow any type of eating before Olot HaShachar.
4. It’s forbidden to eat or drink after Olot HaShachar until one prays except for water or tea without sugar or milk, but the minhag is to be lenient to have coffee and tea even with sugar and milk added.

Mincha

1. From 6 hours (Chatzot) one may not eat a regular meal (of 2 kezaytim of bread or Pas HaBah Bekisnin. If one always goes to minyan and there’s a set time, it’s permissible, even after 9½ hours except by a feast such as a wedding or Brit Milah one shouldn’t start after 9 hours.

Arvit

1. From a half hour before Tzet HaChachavim (of the Geonim, not רבינו תם) it’s forbidden to eat a meal (2 kezaytim of bread or Pas HaBah Bekisnin). If one always goes to minyan and there’s a set time, it’s permissible, even after Tzet HaChachavim except by a feast such as a wedding or Brit Milah one shouldn’t start after Tzet.