Is there an official English guided tour in Bird's Nest and Water Cube? need a booking beforehand?

Dear Helen WN,

Thanks for your inquiry. If you take tours or day trip in Beijing, we can add Bird's Nest and Water Cube in the itinerary upon your request. If you only want to visit these two sites, we kindly suggest you visit on your own. They can be easily accessible by bus no. 82, 538 or 645 or subway line 8. For tours, you may check our Beijing packages for your reference. Thank you.
https://www.travelchinaguide.com/package/beijing.htm