From what I have heard, a householder taking on Shurangama practice should ideally:
- Adhere to the Five Precepts
- Not eat meat, egg, garlic, onion, etc.
- Even better, be a vegan
It is said that a householder may start Shurangama practice and improve on the above gradually. If one cannot become a vegetarian completely (with no alcohol, egg, garlic, onion, etc.) , the advice I was given is that one should consider other more lenient types of practices, such as the Cundi practice.
Namas triya-dhvikānāṃ sarva tathāgatānām!