2 lbs per person per day is pretty good rule of thumb for backpacking/climbing trips in moderate weather. In warmer climates you might adjust that down to 1,5 lbs per person per day. But if you are on a glacier in Alaska in March it is probably 3 or even more pounds per person per day.
An important rule of thumb for menu planning is that half of your per-day food weight should be "lunch".
The point is that even on a bike, carrying that extra weight means you cannot ride as far or as fast and will not have as much fun. Yes, you can carry 50 or 60 pounds on a touring bike. It will handle like a pig and you will suffer up every hill. And if you have an e-bike that extra weight will translate into a shorter range. So you will either do much more pedaling of the already heavier electric bike, or you will be stopping frequently to charge batteries. Better to carry less and have more fun.
I have done long bike tours on the Oregon, Washington, and California (north of Slobispo) coasts, and one memorable trip from Portland to Burning Man and back. Everything you take is bought by the pound and paid for by the mile.