Actually if you know Anapanasati meditation (Meditation of
Breathing Mindfulness), then you can do a 5 minute breathing
meditation. You will feel much relaxed. But I am no dharma teacher
here, if you want to learn meditation you need to find a dharma
teacher.
Yes, I think the most suitable one that don't need teaching is
chanting buddha names or mantras.
But on a higher level... if you know how to apply
awareness/mindfulness, then you would not be affected by stress at
all.