Even if you do not have a vegetable garden, some foods such as herbs (rosemary, oregano, etc.), fruits (strawberries, tomatoes, etc.) and vegetables (lettuce, carrots, etc.) can be grown very easily at home.
Look for a space or spaces in your home where you can put some pots and learn how to grow food.
You can look like yourself with food seeds you have eaten or buy a seedling. Either way, take care of the plants in your small garden and they will bear fruit.
The best time is the harvest, the freshest and most ecological product impossible.