Emergency Snake Babysitting - Need Help

[Rafters]

Hello!

We recently found ourselves caring for an elderly friends two snakes. They look like some type of boas. They have their own aquariums, bedding, heatlamps, heat rocks, water bowls, etc. Full set ups. But I've never kept this kind of pet so I could use some help.

Questions:

1)What temperature range should they be kept?
2) We don't know when they were last fed. They eat like a mouse a month, correct? Since we don't know when they last eat when should be their first meal from us? Should we use live mice or frozen?
3) Their water bowls are plastic weighed down with rocks. The water looks kind of grungy. Should we care? Should we change it out? Any concerns about cleaning the bowls (no soaps, use bottle water, etc.)?
4) Any other advice would be great. We don't know how long these guys will be visiting.

Thanks!