In order to bypass Captcha, you best bet is to just disable it. The option you are mentioning is putting the Captcha value in an alt tag, which would work. However, this would only be practical in a testing environment; otherwise, the whole point of Captcha is bypassed.
This provides some good options:
how to get the data from captcha in selenium webdriver
In short, one of your developers will have to help you bypass Captcha using one of the provided mechanisms in the link above (or using your alt tag method in a testing environment).