If you're really desperate, a bottle of magnesium citrate, plenty of water, and some coffee.
If you're willing to wait a day or so, colace (or a generic) is good.
Also might be a good idea to introduce a good quality probiotic into your daily regimen, especially post-lax. Take it as directed (read the bottle! Some need to be refrigerated, taken on an empty stomach or with food, etc) and give it a few weeks to rebuild the good bacteria in your gut. While that's going on, you could also introduce some foods with pro and prebiotics into your diet, like kimchi, saurkraut, etc.