How to Provision for an Atlantic Crossing: The Complete Guide

Provisioning for an Atlantic crossing isn't complicated, but it requires more discipline than most sailors expect. The difference between a passage where you're comfortable and one where you're rationing rice at day 12 comes down to planning done before you leave the dock.

This guide covers the complete provisioning sequence: how much food you actually need, what to prioritize, how to store it, and the provisioning checklist that experienced bluewater cruisers actually use.

How Much Food Do You Actually Need?

The standard rule of thumb is to carry 1.5 to 2 times the passage duration in food supplies. If you're planning a 21-day passage, plan for 30-35 days of food. The extra isn't paranoia — it's margin for weather delays, unexpected calm days running the generator, or crew appetite changes.

For a two-person crew on a 21-day Atlantic crossing, that typically means:

• Breakfast: 2 cans or packets per person per day (oatmeal packets, freeze-dried breakfast, granola bars)
• Lunch: 2 cans/packets per person (tuna, sardines, spam, pasta packets)
• Dinner: 2-3 cans/packets per person plus fresh fruit/veg for the first week
• Snacks: Continuous supply — nuts, chocolate, crackers, dried fruit
• Drinks: Water, tea, coffee, electrolyte mixes (more on water below)

Water: The Real Constraint

Food is actually the easy part. Water is what kills provisioning plans.

A person needs about 1 gallon (3.8 liters) per day for drinking, cooking, and basic hygiene. For a two-person crew on a 21-day passage, that's 42 gallons minimum — and that's with no allowance for washing dishes, cleaning, or emergencies.

Fresh water capacity on most bluewater boats:

• Under 40 feet: 50-80 gallons typical
• 40-50 feet: 100-150 gallons typical
• 50+ feet: 200+ gallons typical

For an Atlantic crossing, you want to start with your tanks full and have a watermaker as backup. If you're doing a 21-day passage with two people, a watermaker isn't optional — it's essential equipment.

The 3-day water reserve: Always keep 3 days of water in a separate jug as an emergency reserve, even if you have a watermaker. If the watermaker fails, you're not immediately on rationing.

What to Actually Buy

Starches and carbs (foundation):

• Rice (lots of it — it cooks fast and fills you up)
• Pasta (quick cooking, versatile)
• Oatmeal packets (instant, individual servings)
• Bread (will go stale — get fresh for first 3-4 days only)
• Crackers (hardtack style keep longer)
• Flour (for baking bread on passage — if you have the skill)

Protein:

• Canned tuna (light, protein-dense, versatile)
• Sardines (high in omega-3s, strong flavor)
• Spam or other canned meats (denser than fish)
• Canned beans (black beans, chickpeas — add to rice)
• Dried beans (if you have pressure cooker/time)
• Peanut butter (calorie-dense, long shelf life)
• Nuts (expensive but worth it for snacks)

Fresh provisions (first week):

• Onions, potatoes, apples, citrus (keep longest)
• Carrots, cabbage (hold reasonably well)
• Garlic (never goes bad)
• Fresh eggs (can last 3-4 weeks if properly stored in cartons)
• Cheese (harder cheeses keep; avoid soft)

Extras that matter:

• Coffee and tea (psychological comfort is real)
• Hot sauce / soy sauce (transforms boring food)
• Lemon juice (hides staleness)
• Bouillon cubes (flavor base for everything)
• Chocolate (morale critical)
• Electrolyte mixes (prevents cramp issues)

Storage: How to Actually Keep It

The way you store provisions matters as much as what you buy. Here's the hierarchy:

Day 1 access: Fresh fruit, bread, eggs, cheese — things you'll eat in the first 3-5 days. Store in accessible locations (no digging through lazarettes at 3am).

Week 2 provisions: Canned goods, pasta, oatmeal. Secondary storage.

Week 3+ provisions: Rice, beans, long-life items. Deep storage.

Critical rule: Everything in watertight containers. Salt air, humidity, and occasional green water coming through an unlocked hatch will destroy unprotected food. Double-bag dry goods in zip locks, then into plastic bins.

The Alcohol Question

Many bluewater cruisers carry beer and wine as part of normal stores. This is fine — but it should not be ration alcohol. If you drink a beer every evening as part of normal life, that's fine. If you're drinking because you're bored and uncomfortable, that's the beginning of a problem.

Separately: most sailors carry a bottle of rum or whiskey as a comfort item. It takes up minimal space, keeps indefinitely, and has legitimate uses for cleaning wounds, disinfecting, and morale.

Final Provisioning Checklist

Before you leave:

• [ ] Water tanks full
• [ ] Watermaker serviced and tested
• [ ] 3-day emergency water reserve jugged
• [ ] All dry goods double-bagged and in sealed bins
• [ ] First-week provisions accessible (not buried)
• [ ] Canned goods inventoried and rotated (oldest to front)
• [ ] Coffee and tea supply adequate
• [ ] Snacks for each crew member separately packed
• [ ] Special dietary requirements accommodated (crews with allergies, etc.)
• [ ] Galley inventory checked (no missing pots, lids, can openers)

Good provisioning is what separates an Atlantic crossing where you're comfortable and well-fed from one where you're stressed and hungry. Start the list two weeks before departure and build it systematically.