Maint. for 2.5 gallon aquarium

[Rava]

What kind of maintenence should I do for a 2.5 gallon aquarium? No filter, rock gravel, fake plants, 1 female betta. If you need any other information to advise, feel free to ask. Thanks!

 

[Zelda000]

Change one Cup of water a day, i had a 2.5 and for the time i had it, everyday i would come home from school and change a cup of water. this way helps keep water clean without filter and all. let me know how it goes

 

[Forum221]

I have a 2.5 gal that I keep feeders in, they are never in there for long. It has 2 Mini BioWheels going in it. (This may seen like a waste of filters but i got them for free from a friend at a pet store)
I never change the water but add some every week due to evaporation. All that is in there is gravel.