Can I use dry ice for a week-long camping trip?

Yes, but you need to handle it right. Dry ice is colder than regular ice (–109°F) and lasts longer—a 10-pound block in a decent cooler can keep frozen food solid for 5–7 days if you don’t open the cooler much. Use a rotomolded cooler with the drain plug open to avoid pressure buildup, and never seal it airtight. You’ll need about 10–15 pounds per day for a 50-quart cooler, so for a week that’s 50+ pounds—heavy and space-consuming. Honestly, unless you’re committed to no-restock frozen food, regular ice with a good cooler is simpler.