When should one say "Bismillah" again upon eating or drinking after having finished a previous meal, and what is the interval between the two meals that necessitates saying "Bismillah" again, and should others be reminded to say "Bismillah"?

A Muslim must mention the name of Allah the Almighty when eating. If he forgets at the beginning, he should say: "Bismillah fi awwalihi wa akhirih" (In the name of Allah, in its beginning and its end). The naming is done once at the start of eating. However, if the dishes are removed and other types of food are brought, or if one leaves and then returns, he must repeat the naming. It is permissible, and even a Sunnah, to remind those present to mention the name of Allah, and it is not sufficient for only some of the eaters to do so while others do not.