Well lets see - it will be for 14 days and is primarily for photography, both landscape and animals (birds). I can easily drain a battery per day doing this unfortunately.
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Really? How many images are you shooting in a day?
I have done 14 day trips with two batteries (and that was the MKII battery though I now use the MKIII which is way, way better) including some pretty cold temps (10,000 feet in October) and did just fine on those without charge (no place to charge as in your case).
I have also shot week long jobs with just one MKIII battery (4000+ clicks). Granted this is tops for the battery in a more ideal situation.
I agree with witz that 2500 is a good average number for clicks/per battery.
So I ask again, how many clicks are you doing in a day?
Ken