I have received two internship offers. One company (company A) gave me a deadline (tomorrow) to accept or decline - although, it's not a formal offer letter. Rather it's an "expression of our intentions regarding your employment and should not be considered an employment contract".
Another company (company B) selected me but an offer is contingent on funding which will "likely" be provided. I should hear from them in the next week. I prefer company B. Would it be unethical for me to accept company A's offer and then back out when and if company B provides me with an offer? I figure most companies wouldn't hesitate to rescind an offer so I should look out for my best interests.