Yeah, some bettas are iffy about flakes. Pellets are the way to go, and you can get brine shrimp or blood worms as a treat.
But be sure to condition the water! That is a must! A lot of people reccommend Prime, but they don't sell it here. NovAqua is the one I use, incase you can't find any Prime.
And don't forget a heater, if you don't already have one.
Puck (Yellow koi HM king) / Scar (White HM) / Salt 'n Pepper (Silver HMPK) / 'That fish' (Copper butterfly HM) / No name (White DT) / No name 2 (Turquoise/white marble HM) / No name 3 (Lilac HM)
Bo Peep (Cambodian VT) / Goldilocks (Yellow VT) / Joie de Vivre (Multicolour VT) / Lil' Peep (Blue VT) / No name (Dalmatian VT) / No name 2