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Bottling: fill & mix

What it is. An athlete’s Setup describes the vessels they carry, their carriage, and how each one is filled and mixed. Saturday maps the per-hour prescription onto that carriage, so the athlete knows what goes in each bottle and when to drink it. When to change it. When the athlete’s gear changes, such as more or fewer bottles, a bigger flask, or a feed zone on course. When a mix that is too concentrated is causing stomach trouble. When what they carry does not cover the session’s duration. What the athlete gets. A concrete bottle plan with fill volumes, scoop counts, and a drink cadence, with none of the math left to them. The question it answers. “How much do I put in each bottle, and how often do I drink?”

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How carriage is structured

Carriage is stored per activity type, not globally. A cycling Setup and a running Setup are separate, each an ordered list of slots. A slot is one vessel with a maximum volume. So “how many bottles” is the slot count for that activity type, and “how big” is each slot’s volume ceiling.
There is no concentration dial. Concentration is an outcome, not an input. You set what the athlete carries and how large each vessel is; Saturday works out how much carbohydrate and sodium go into each one to hit the prescription. To make a mix less concentrated, give the athlete more fluid capacity to spread the same carbohydrate across.

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What you do as a coach

  • Read it first. Open the athlete’s current carriage before changing anything, so you are adjusting from ground truth rather than a guess.
  • Edit the slots. Pick the activity type, then add, remove, or resize slots. Saturday re-maps the consumption plan and shows a one-line impact preview as you go. See The Setup.
  • Pre-fill for a new athlete. For an athlete who is less comfortable with the app, you can dial in their bottling from your roster before they ever open it, so they arrive to a working plan.

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See also