That's one reason I never keep those items NEXT to one another. It's just an accident waiting to happen for someone who's never cleaned before.
- Bleach = laundry area by the washing machine (next to the detergents)
- Vinegar = kitchen cabinets next to the cooking oil, 5lbs of K-salt.
- Ammonia = Utility closet (Vacuum & other misc cleaning supplies)
Hopefully you purchased "unscented" bleach.
Don't you have any $1 or $2 stores in your country?
Buy a "CLEAN" spray bottle. (Taller is better) You can attach the sprayer to any liter sized water bottle & fill it up with your bleach solution.
There's plenty of information out there when it comes to cleaning with bleach. Make sure you have proper ventilation in whatever room you're doing this "tank cleaning" in.
Keep the kids/animals away.
Bleach fumes can make you ill too, cause your lungs to feel like they're on FIRE.
Good luck, I'm sure someone else can guide you through the rest.