Iceland is gonna be so freaking amazing!! I totally feel your pain on the extra costs tho, it literally never ends... but you absolutely need more juice for those cold hikes or youll be so sad. The Z6 is thirsty and the cold kills batteries fast.

• Nikon EN-EL15c Rechargeable Li-ion Battery is my top pick for safety. It handles the freezing Iceland wind way better than cheap knockoffs. Super reliable and won't throw errors!
• SmallRig EN-EL15c USB-C Rechargeable Camera Battery is a fantastic budget option if youre tapped out. It has a built-in USB port so you can charge it from a power bank in your backpack while youre trekking. Genius!
• Expert Shield Nikon Z6 Glass Screen Protector is a total must-have too. Iceland has volcanic sand and rocks everywhere... one drop and your screen is toast without it. Seriously dont go with just one battery or youll miss the aurora!

You shooting waterfalls or aurora? Watch out for the spray... Peak Design Shell Medium is tough but pricey vs Op/Tech USA Rainsleeve which is cheap but flimsy. TL;DR: dont get it wet.

i know the card prices sting, but im really satisfied with the Lexar Professional CFexpress Type B Gold Series 128GB. it handles the Z6 data rates easily and hasnt failed me yet. you basically need a card to even use the thing, so grab that and a SanDisk Extreme Pro CFexpress Type B Card Reader USB 3.1 Gen 2 to keep things moving. no complaints, it just works well.