LDO regulator REG1117-3.3
Comment reposted as an answer so that the question can be closed:

The datasheet isn't describing a bulk capacitor and a separate low ESR capacitor. It indicates you need a bulk capacitor with a low ESR. The values is given in the text above.

Keep in mind that this is an old part and old datasheet, these days a ceramic capacitor that meets the requirements is fairly easy to find and is probably a better choice.