Can you store milk in regular bottles??

Alexis • 3 year old Chloe💖 11/15/15 & Jacob 💙 3-5-19
I'm a FTM and I don't have my pump yet because I'm suppose to get a free one through my insurance ( my baby is only 4 days old) but my breast became engorged so I started hand expressing my milk out. I figured why waste milk ( I produce about 3 oz each time between my 2 breasts). I don't have the storage containers because I was going to wait to get them to see what brand my pump is. Anyways I'm hand expressing into regular bottles ( tommee tippee) and I am freezing the milk, does anyone know if it's okay to do it this way? Or should I just "pump & dump" until I get storage bottles?