Hopefully, another rescued JRT

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As I wrote in my other post, we have just been contacted by another small rescue group a 6 year (but age is unclear, could be 7 or 5) old JRT, neutered, not aggressive and certified by a vet (and by the vet's cat) as good as gold with cats but... he has no teeth: when he was about 4 (but as I say his age is uncertain, could be that he was 5 or 3) he developed a tooth abscess and his owners decided to leave him at the municipal shelter (claiming they did not have the money to take him to the vet), he remained there 3 months with this enormous abscess (at the shelter they did tried with antibiotcs but they did not have the resources to get him operated) till he developed a mouth and gum infection with fever, difficulty in eating etc.. Fortunately, when he was weighting only 5 kilos and very feeble, he was rescued by a volunteer who took him to the group shelter where he finally received the proper care by the vet, staying at the clinic for 8 weeks. Unfortunately, the damage was so extensive that finally an animal dentist surgeon, consulted about his case, had to operated him to pull all the remaining teeth. He has recovered completely and we are going to see him this Saturday and hopefully (if it goes well with our dog)to take him home. We don't care about the teeth and we know that his gums are almost completely hardened so he can eat almost anything (accoding to his vet) but do you have any ideas about the best food for a dog in his situation (from a shelter albeit a good one and no teeth)? I don't want to upset his stomach feeding him something too rich or wrong. And what about supplements, vitamins etc..?
Also, this time I would like to prepare the house properly so any suggestions will be very welcomed.

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Actually the adoption did not go through: the dog was so scared of us that he would not even come near us (my husband and me went in to the shelter to meet him separately) and when we went with my dog for a short walk on a nearby field he was constantly trailing behind the lady of the rescue who has saved him, nursed through all the operations and visits him twice a day (she also pays for his keep). Besides, my dog (that is usually very sociable, I know only of another dog she does not like) hated him at first sight, fur raised and showed him (quietly, not growling but still...) the teeth when he tried to sniff her. So it was quite unsuccessful for us but very good for the dog as the lady decided on the spot that he is unadoptable, only her can take him and took him home with her.
We came home a little depressed but contented with doing the right thing for our family and still determined to find the "perfect" (reasonably so) dog. To continue...