A smile doesn't cost anything, remember to smile even when things are not going in proper order.
Smile when you hear the birds chirp as your ears are working fine :)
Smile when you eat food as you have food to eat.
Smile as you drink water as its clean.
Smile when you meet someone as someone still is looking forward to meeting you.
Smile when you wake up as you are still alive.
Smile when you sleep as the full day you lived through.
Smile when you are in problems as God gives issues to only those who are capable enough to solve the problem.
Smile anyway to make others smile.
Smile is the cheapest medicine and the most straightforward meditation that can be done a full day without any course or learning.