u/Enough-Hippo6859

I am a first time betta owner, and I have a 5 gal tank with a filter and heater. The only animal in my tank is a 7 month old male betta. I am going on a trip for 3 weeks and don't know if he can survive without a water change. I have someone that will come and feed him but I don't have someone to change his water yet. Pls tell me if i need to get someone!