Things You'll Need to Do after the Break Up

You can do it without the following items, but they are highly recommended for the most rewarding (yes, really!) experience possible:
A few shoulders to cry on. It really does help to talk about it, preferably to more than just one person (if only to give your best friend some relief).
A Teddy Bear (for hugs and to talk to at 4am when everyone else is asleep.) Dogs and cats will do too, although pets may not always give you quite that loving sympathetic gaze and undivided attention that bears are so good at.
Hot showers (As much as you may not even want to get out of bed, much less get in the shower - *sniffle* "who cares if I wash my hair now, anyway?" - you will feel better after a shower, or a nice long soak in the tub. Hot water relaxes tense muscles, soothes anxiety and refreshes puffy, tear-stained faces.
Paper and pens (a journal is perfect, paints and glue and other illustration tools, even better!)
Funny movies and absorbing novels can be a great temporary respite and laughter can really lighten your mood.
If you're one of the millions who try to fill that empty sad feeling through your mouth (which usually doesn't work because food isn't what you're missing), fill the fridge with celery sticks and other light snacks that you won't regret later if you just have to munch.
Do be sure to eat though! Heartbreak can often rob you of your appetite, but be sure not to to punish yourself and remember to think about you as you are the most important person now. Being ill from malnutrition won't help you be strong enough to move on.
Your sense of humor and your knowledge that "this too shall pass".
Lots of tissues.
Friends and family are supportive for some people, and if they are they will do anything and everything to help you heal and be happy again. Go with them, even if you don't feel like it - you won't regret it. If you have unsupportive people in your life, you need to seek support elsewhere.