Alkaline batteries have very high internal resistance, and are not suited for high drain applications like digital cameras. You will find that they will take not more than 10-20 shots before conking out. They are more suited for low drain applications such as radios and alarm clocks.
The ideal types of batteries for digital cameras are rechargeable NiMH or lithium-ion batteries, which have a low internal resistance and can therefore continue delivering high-drain power for much longer.
If you are going to a place where you cannot recharge the batteries (ie no power supply) a good alternative to consider would be Lithium AA cells (note - these are NOT lithium-ion batteries and are NOT rechargeable). They are light and last very very long. They are also pretty costly, about 8-10 bucks EACH. A bit hard to find also, but Cold Storage carries them I think.