Sustaining is building character, physical and mental health and solid values and not obtaining material things of little intrinsic value. Do the right thing and what you need materially will follow.
Thinking creatively about solutions to negative situations is positively coping.
If you choose your friends and who you associate with carefully, they will be aware when you need them there for healing and when you don't, allow you to mend on your own.
We are not the sum of products we consume but our choices about products we consume do sum us up.
It is far better to have your voice heard by a small group of good people with character than a thundering herd.