To get the food it can either be bought with Smurfberries (400x Food for 25 Smurfberries) or grown in the animal sanctuary.
At the bottom left corner within the sanctuary there is a garden where little bushes can be placed (available for 40 Coins from the build menu) that can be used to grow food.
Growing food on them works just as with magic shrubs, simply click on the bush and choose an amount of food to grow.
The animal sanctuary will not show a sign when in the main smurfs village indicating that the food has finished growing. We do not know if this is a bug and will be changed in the future or if it is intended, as the food does not wither. Either way, at the moment, there is no indication to when the food is ready when not being inside the animal sanctuary.
The following amounts of food are available:
Small Pile of Food
5 Coins 30 seconds 1 5 Coins 120
Big Pile of Food
30 Coins 5 minutes 5 6 Coins 60
Bowl of Food
210 Coins 1 hour 30 7 Coins 30
Jar of Food
1050 Coins 6 hours 150 7 Coins 25
Bucket of Food
2560 Coins 8 hours 320 8 Coins 40
Basket of Food
5400 Coins 12 hours 600 9 Coins 50
Barrel of Food
11200 Coins 16 hours 1120 10 Coins 70
Sack of Food
37440 Coins 24 hours 3120 12 Coins 130