Below is the link for you to fill out and submit for the "Affidavit Request for Exemption from Immunizations for Reasons of Conscience"
(We have found this is an easy way to apply)
I would ask for five affidavits per child (which is the maximum allowed). (As I recall, there is a charge for each affidavit).
The Texas Department of State Health Services will then mail you the affidavits, which basically are ready for you to sign and notarized.
However, only sign and notarize them on an as needed basis. I believe they remain good for two years from the date you sign and notarize them. Hence, if you wait until you need to use them, they will not expire. And once you run out, you apply for more.
More information about this can be found at the following site:
Unless they have changed the affidavits, the affidavits list the various types of immunizations that you are seeking waiver of. You can check some or all of the boxes (as I recall, we check all of them). Hence, you do not need to decide now which immunizations you are going to ask a waiver from. (This also explains why the State is not asking you for such info in your affidavit request).