Anti-candida diets get down on vinegar for silly reasons - nothing based on actual chemical composions, just a general fear of all things "preserved." As long as it's apple cider vinegar and not white, you're fine. ACV is a natural antiseptic and anti-fungal, in fact.
Flax seeds can be used in a multitude of ways. Ideally, one would buy whole flax seeds and grind them up in a coffee grinder and either add to hot cereal and eat, or just swallow them down in water like the P&B shake.
You can leave them whole so that they are just pure fiber moving things along, but they have such great things on the inside, and are too tough for the stomach to dissolve, so grinding them releases their goodness.