Paddling in southern BC during August may provide you with water warm enough for swimming.

Inlets like the Salmon and Sechelt along the Sunshine Coast are warmer than open waters such as along the west coast of Vancouver Island and more northern inlets coursing the Inside Passage to Alaska.

Tide tables for area.
Topo map of area including camp grounds, streams, tide conditions.
Field Guide if tasting wild foods.
Book for reading.

Fresh Food: 

TIP: Have enough food for seven days should you get stranded in bad weather.

Two days of fresh food:  eggs, steak, frozen fish (first day), potatoes, carrots, asparagus, apples, broccoli, tomatoes, salt/pepper, other spices as needed.

Dried Foods:

rice, noodles, cereal (oatmeal, 7 grain cereals)

Canned Food:

Sardines, Spam, Stew

Magnesium match and matches in waterproof container.

Water:

Water purifier, Personal water container and an extra gallon container per person.  Keep topped off, visit streams often.

Cooking:

Camp stove (I prefer Coleman for hot burn, but bulky).
As few cooking pans as necessary:  Two quart pan for boiling water, noodles, rice.  Ten or Twelve inch teflon pan for cooking eggs, pancakes, steaks, vegetables (two pot cooking).

Safety:  

Throw rope in throw bag.
Paddle float for each boat.
Bailing bucket (gallon milk jug with top cut off) and high volume pump.

Luxuries/Optional:

Camp chair (aluminum, that can be attached to kayak, jettison if it becomes a hazard in rough water).