Some establishments simply remain closed for the duration of the holiday. But yes, there are some pizzerias that make unleavened Pizza; and you can also find Sandwiches, Hamburgers with buns, and pita. In all of these dishes, potato flour is used. Some are tastier than others.
Lamb can be kosher for Passover. However, Ashkenazi Jews traditionally do not eat lamb during Passover.
Pareve kosher for Pesach margerine is available at kosher butchers and some supermarkets that stock a large Passover inventory.
Only if it's certified kosher for Passover.
It would have to be certified kosher for Passover.
There are brands of kosher for Passover baking powder but they have to be marked specifically for Passover.
There are kosher brands of condensed milk, to be used during Passover, it would have to be certified kosher for Passover. In regard to sweetened condensed milk, most use corn syrup which is kitniyot. There are substitute recipes for this product though.
Yes, but it should be labeled as having had Rabbinical supervision for consumption during Passover.
The label has to say "Kosher for Passover"
Yes, only if they are specifically certified kosher for passover. You can find kosher for Passover olives at any Jewish supermarket
Yes, they must be certified kosher for Passover though.
It can be, it would require a valid Passover hechsher.
Yes, it can be since it is made from wine, which can be Kosher for passover if created under appropriate supervision. The bottle would require a kosher for Passover hechsher.