Little and often is the key, don't drink anything before eating as the fluids will fill you up.
If cooking puts you off there is nothing wrong with ready meals, tinned soup and sandwiches.
Switch from low fat to high fat and if you normally have a sweet tooth now is the time to indulge. You can buy single portion sponge puddings with custard, just a minute in the microwave. Small tins of rice pudding.
Cook chicken breasts or legs for sandwiches. Fish is a good source of protein, too, tinned frozen or fresh.
Cheese is great to snack on, with crackers, fresh fruit, fruit cake.
Something on one piece of toast might be nice - baked beans, an egg, cheese or jam/honey/chocolate spread.
Tinned fruit is good as it will keep in the fridge after you've opened it. Have some with cream, ice cream or just as it is.
No reason you can't eat breakfast cereal any time day. One weetabix with warm milk and sugar is great at bedtime, can help you sleep.
Try Complan if you really don't want to eat. Make it with full fat milk, split in to two glasses and put one in the fridge for later.