The short answer
Provision in Puerto Vallarta the night before you cross. Between the local market shops and the big retailers — Walmart, Costco, Soriana, La Comer — the city has everything. Pack perishables in a cooler or cooler bags for the hour on the water, and bring more pesos than you think you need — there are no ATMs and no card machines at Los Chonchos or in Chimo.
Questions people ask
How much food should I bring? +
Everything you intend to eat, plus a margin. Chimo covers gaps, not plans.
Is there drinking water? +
Yes. The tap water is gravity-fed mountain spring water, tested clean. Every bungalow also has a five-gallon jug of filtered drinking water on a dispenser — one is included in the rate, and each additional jug is 200 pesos.
Can I buy alcohol there? +
Nothing is sold at Los Chonchos. Bring what you want from Puerto Vallarta, or have cold beer brought over from Chimo by boat.
What if I forget something? +
Ask the staff before you go without — there is often something they can lend you. Otherwise the two stores in Chimo cover a few basics, and beyond that you manage.