I have a solution containing various bacteria and fungi. My aim is to place solution on filter paper, and wait until it dries. I then wish to test if the organisms have survived, either on the dried paper, or by rehydrating it (maybe placing the paper into water). Can someone provide advice on the type of test(s) I should perform to achieve this result? Preferably the test would be easily sourced (purchase online?) and relatively cheap and easy as I am quite inexperienced in this area. Thank you in advance for any advice that you can provide.