PhD advisor lost funding, need advice I am an international PhD student in an engineering department in US and was fully funded for all two years, but just two weeks before the fall semester (without any warning), my advisor informed me that he cannot support me, apparently he lost all the funding sources this July. He is quite happy with my research and wants me to pay this semester at least half of my tuition and live on half of the monthly stipend. He informed me that after this fall he will find a TA to support myself.

Now, my problem is that my work is experimental and needs constant funding. While TA will cover my expenses, it will not cover the experiments. Even he does not know how and when the funding for experiments will come (he didn't look confident at all). Should I think of changing the advisor now? I am personally thinking of taking an MS with my current work and looking for a funded lab for PhD in the same university.
If your advisor can't support you and your research, find another advisor as soon as possible. Your department/grad program should be able to help with this and talking to them should be your next step - it's also possible they can do something to get you funded in the immediate term. In fact, this should have been the advice your advisor gave you instead of suggesting you try to float around for a semester.

You might be able to keep your current advisor as a co-advisor or something, but frankly the way they handled this situation (waiting to tell you until now) is absolutely horrible and unprofessional (and selfish): they would have known long ago that funding was expiring and if they were waiting on some pending grant applications they needed to inform you then so you could line up other support.

I wouldn't be able to trust that person again.