Read Section 46 of Factories Act for stipulations regarding canteen and number of workers
Similarly a reading of Section 45 will make it clear the need for first aid facilities and ambulance.
Querist needs to read Factories Act,WC?EC act,payment of wages,Gratuity Act etc to be aware of latest rulings on these subjects.
Bread and butter subjects of HR must be kept readily available along with latest case law for reference.