They used to be a mom and 4 kittens
Now, DW is seeing only one kitten and the smell in that structure behind outr house indicates other kittens may have starved and died

The kitten is 2 or 3 months old. She is active but seem not smart or experieced enough to climb a ladder we have put there and get to the outside world.

We have been leaving food, and it eats it at night when we are not watching. Problem is that one week from now we are leaving for a 3-4 day trip.

I am saking here for suggestions for long lasting type of food that :
(a) can stand the July heat (around 45 deg C) without spoiling
(b) attract the kitten to eat, without attracting a big male cat that used to visit the area(3 weeks ago)

I am also thinking of a water supply that won't evaporate, but food is my prime concern for now

Thanks