On the Round Ireland I was fine with dry fruits , dry meat , nuts - all waterproof packed - and water . At sea I was never really hungry and a few fruits & water gave me enough energy to get on .I never had the wish for a hot coffee or tea although weather was not always nice .
Bananas are great and would be my first choice but in most marinas hard to get ..
Sausages are also nice - the german team had them
but they should not be too spicy so that you wish to drink plenty of water after .
Coolbox would be nice but it should be than a compressor box . The other car stuff does not work well and for simple cool boxes you always need ice - which is also hard to get every morning .
The best thing after being the whole day at sea is to have the first COLD BEER in the evening at the pub