In my experience (especially all of the times I fall off and get back on that wagon), the best thing that works for me is reminding myself of what I want. Is that yucky, fattening, high carb food going to taste good enough for me to start over again and take 3 days to get things going. I keep doing it, but I know what I gotta do, so don't beat yourself up anymore. We (well many of us here anyhow) all fall off and get back on.
So, remember your water (gotta drink it). Always be prepared (we keep extra packets at work and we always pack more than enough stuff when we go away).
Keep the house stocked with the right snacks (pickles, celery, soy crisps, SF jello and poscicles.
I use SF syrups (Torani and DaVinci) to add to things, as well as spices to help the taste of some of the foods.
Don't let others impede you.
Eat healthy when you eat out, make good choices. Don't overthink it also.
Other than that, I would say just use your best judgement and stick to your guns!
Good luck