I think, Senku should be able to make photos, so camera it is :)
Ah, yup definitely something essential by how we live. Senku wouldn't make it for the fun/social aspect, but since it can be used for a variety of useful ways I have to think it is going to come up. The most technical part is the film, which Kaseki should be able to handle.
And from the food... emmental or camembert-like cheese, sounds easy, but where to find right bacteria, on what should it be cultivated, and how to get a milk XD...
I didn't eat dinner yet, so this is making me more hungry...>
tho I watched only anime, don't know, if it was actually done already
Nope, this is meant to be an anime-friendly discussion so no worries!