Preheat oven to 350 degrees F. Line a baking tray with either parchment paper or silpat.
In a bowl, combine all the seeds, salt and water. Stir to combine. Let mixture sit for 15 minutes, stirring every 5 minutes to allow the flax seeds to gel and bind everything together.
Spread evenly on prepared baking pan. The thinner you spread it, the crispier your crackers will be.
Bake until crisp for 25-35 minutes of until firm.
Remove from the oven and let cool completely. Snap into crackers.