Alfred would never let his boys starve, any of his boys. And indeed all the boys who have resided in the halls of Wayne Manor, he considered his boys, even those who were old enough to be considered men.
Given this fact, it wasn't surprising that Alfred spent time checking and re-stocking his boy's safe houses. Not so regularly as to arouse suspicion, and definitely not as himself. Alfred was a master of disguises, and he enjoyed portraying other characters, it wouldn't do well to let his acting skills rust after all.
Dick didn't really like it when Alfred restocked his cupboards. The young man's idea of a balanced diet included take away and cereal, so Alfred wasn't really surprized that Dick protested whenever Alfred came over and brought groceries. But the boy, for they were all boys to Alfred, was grateful enough when the butler showed the numerous boxes of cereal, and cartons of milk, that was included in said bag of groceries. And of course, Dick never complained about the meals Alfred made that he only needed to reheat.
Jason hated it when Alfred has been through any of his safe houses. It usually meant that Bruce had access to his place at any time. What Jason didn't know was that Alfred, whose security clearance was above and beyond even Bruce's, kept tabs on all his boys and did not necessarily inform Bruce. They boys just assumed that Bruce knew everything because Bruce was Batman. In any case, Jason was appreciative enough of Alfred's efforts, especially since it meant that he had food that wasn't past its expiration date or bandages and other medical paraphernalia whenever he needed them.
Tim was glad that Alfred restocked his food and his medical supplies. But he was even more grateful for Alfred's constant supply of coffee beans. Tim worried that when he left Manor, he would have to make do with, and he shuddered at the thought, instant coffee. No one in the Titans seemed to be a coffee enthusiast except for him, so it came as a surprise when he opened his pantry that there was a can of the coffee that he preferred and a coffee maker with a timer so he could have his coffee as soon as he woke up. That the rest of the team didn't even know who brings in the groceries is a testament to Alfred's proficiency in sneaking around. Alfred really was a miracle worker.
Damian was a tricky one. Although he was living under Alfred's watchful eye, it didn't necessarily mean that he was eating properly. In fact, when the boy first came to live with them, he maintained a diet like his father's, that is to say not really eating and subsisting of a mixture of power juices and coffee, which is not at all a healthy meal for a 10 year-old. Oh sure, Alfred was glad that the Young Master Wayne wasn't into junk food or cereal, but the boy needed proper nutrition, all his boys do.
Which was why Alfred talked to Bruce about setting a good example for all the boys. Alfred's oldest charge was by far his most difficult one. Sure the man was The Batman, but he could also burn water (on a stove, Bruce's survival skills and his ability to feed/sustain himself in the wild is never questioned.) Bruce also had an aversion to a sit-down meal (one that had no purpose for business or the other business) which was definitely not conducive to family bonding moments and setting a good example.
Bruce would have protested, but Alfred insisted. And there might have been bribery and blackmail involved, not that Alfred would ever admit to anything.
Thus the bi-monthly family dinners were established. Which was why Jason made sure to be in some other part of the world whenever the dinners were scheduled to occur.
AN: No idea about the Titans (I only read them if they overlap with the main Batman story line) and their coffee consumption. And fanon seems to indicate that Tim is the coffee-addict (of it could just be my headcanon.)