We bought sheets in the local hypermarket when we went to a Eurocamp place 2 years ago -the "sheets" provided (at an additional cost) were basically disposable and wouldn't stay on beds. We left the double for our bed behind, and DD took her single one home (as she had chosen a black one!).
Camping/travel towels would be useful - Decathlon do them cheaply - both as towels and as spare bedding/blankets/rugs if necessary. The travel type take up very little room.
In terms of kitchen, I have a "camping/selfcatering box" which tends to travel if I have room, and a few selected items from it if space is at a premium.
1 decent sharp knife (I have 3 decent ones, each with a cover on the blade, for out of the house use)
Corkscrew - waiters mate type
Peeler
1 wooden spoon
Silicon oven gloves (small size)
100ml bottle of washing up liquid (squeezy travel bottle filled at home)
Salt and pepper mills (the type that are glass jars with a mill in their top - disposable ones in supermarket - or I might buy on arrival)
Some seasonings - especially if I can get some sachets of vinegar etc
Pack of cards, a travel board game (monopoly or connect 4 or similar)
Proper teabags (I drink Barry's tea, and only Liptons comes anywhere near it on the Continent, but its easiest to bring a box of 40 or a handful in a Ziploc bag)
Camping coffee plunger (plastic so unlikely to break)
And a couple of toilet rolls for day 1, just in case
(Any particular items from home that we are unlikely to get in FR that DD or DH really want - maybe a couple of tins of something particular - tastes change over the years, the tiny concentrated squash as FR don't do Robinsons have been recent ones etc)
I tend to assume I will go to local hypermarket/decent supermarket on day 1 to get lots:
1 mug for decent cup of tea (DH and DD will live with the tiny cups!)
a couple of kitchen implements if really needed
Basics like
Olive oil
Salt and pepper (I might bring small ones, or buy on arrival)
Coffee grounds
Jam
Butter
Crisps
Matches
Kitchen towel
Toilet roll
Milk
Shampoo, conditioner, shower gel etc - much easier to buy on arrival!
Pack of j cloths or a pot scrubber or wash up brush - expect to leave this behind
Ketchup etc