One way you can help involves eating. First figure out what you normally spend on dinner each night. Then take one week and see how cheaply you can eat and simply donate the difference to a local food bank.
Another idea involves shopping. Step one is to go through your closet and weed out all your old clothes. Next donate them to a homeless shelter or charity. Now shop for new stuff and fill that closet back up.
Maybe you're more of a social person? Get a group of friends together and donate an evening to a soup kitchen or other charity. This is also a great idea for a group date night.
OK, so those are my three ideas but you might have even better ones. So, I challenge you to come up with three realistic ways you can fight poverty and then... follow through with them!