Q: bash: apt-get: command not found

What is going on? I urgently need to resolve this for internet access!!!

A: Apt is used as a front-end to debian dpkg.
Does dpkg work?
You can download apt (and related packages) here:
http://packages.debian.org/stable/base/apt
then do a:
dpkg -i apt_0.5.28.6_i386.deb
and also for needed depends.
apt-get -f install
should clean up missing packages.
I am not sure what you have for sources from your post.