You could leave a few unused tea bags in your fridge and freezer to prevent smells even if the door is closed. I had to store my house contents for six months during a house move and the removers had to shut the fridge and freezer door during transit but they assured me there would be no smells if I used tea bags - they were right!
Regarding turning off the water. We were getting mums house ready for rental and it was empty for a few months while some decorating was being done ( during the first lockdown so took ages!). Unfortunately, just as it was ready, there was a major water leak, unnoticed for several days which caused over £20,000 of damage and six months lost rental. Under normal circumstances the insurance company would have disputed the claim as the conditions of insuring an empty property was that it had to be visited once a week. Luckily due to Covid restrictions on travel they had taken out this clause so they paid for all the remedial work.
It’s worth checking your insurance paper work for the small print and also letting them know the house is empty, it cost us an extra £60 in cover to maintain the insurance but in our case, it was well worth it! I go cold at the thought that my sister did not want to pay, saying it was a waste of money!