Nuun tablets are a good source of electrolytes. I like the Lemon+Lime and Orange Ginger favors. Here's a link to a post that I wrote about them:
Boston Marathon Finisher
McDonalds french fries are a great source of sodium.
JUST KIDDING. Nuun tablets are good. You can get them at running stores, REI or the internet.
"Victory through attrition!"
Charleston Half-Marathon 1/15/2011 -- 1:52:03
The Scream! Half-Marathon 7/16/2011 -- 1:56:00