The questions I ask are probably going to sound incredibly stupid, but I'm new to bitcoins so excuse me

I'm getting into bitcoins essentially because I want to save money on ModafinilCat, but I'm confused about taxes.
1. If I make bitcoins by doing survey's and only use what I gain on ModafinilCat, am I liable to be taxed?
2. Is it possible that I'll go into bitcoin debt due to taxes?
3. I can't be taxed if I have a grand total of 0 bitcoins, can I?
4. Do I need to keep a fancy log or have a bitcoin tax calculator? (Considering I'll only be making purchases off ModafinilCat)
Yeah yeah I'm an idiot but answer the questions anyway

thanks haha