The Five Precepts were specially formulated by the Buddha for the benefit of His non-monastic lay followers. They aren't meant to be do-or-die vows demanding strict, 100% observance at all times and in all situations. They are rather ideals to be aimed for. The Buddha's teaching is all about developing awareness. No decent person would consider any of the precepts as too difficult or extreme, but the point is that as soon as one takes the precepts upon oneself one is more likely to be aware of those times when heedlessness could easily take over, with all the attendant consequences.

(The Pali formula follows the English in italics)

1. I undertake the precept to refrain from destroying living creatures.
   Panatipata veramani sikkhapadam samadiyami
2. I undertake the precept to refrain from taking that which is not given.
   Adinnadana veramani sikkhapadam samadiyami
3. I undertake the precept to refrain from improper sexual activity.
   Kamesu michachara veramani sikkhapadam samadiyami
4. I undertake the precept to refrain from incorrect speech.
   Musavada veramani sikkhapadam samadiyami
5. I undertake the precept to refrain from intoxicating drinks and drugs which lead to carelessness.
   Suramerayamajja pamadatthana veramani sikkhapadam samadiyami