Fist off, congrats on your new leo 
Three crickets is too little. Feed him as many as he will eat each night since he is still a juvenile. as he/she gets older, they will eat a lot less frequently, but when they are young you wanna make sure they are getting as much as they want to eat every day. This can easily be 8 or more crickets. Make sure your crickets are the right size, too (no bigger than the space between the geckos eyes.)
Ideally, yes the water should be changed every day, or whenever it gets messy.
And albinos can be kept with regulars. I dont know where you heard they couldnt
Its not a problem.
Good luck!
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~Melissa~
1.3 Leopard geckos (Guido, Oasis, Gypsy, Marli)
1.0 Bearded dragon (Pharoah)
1.0 Hog Island Boa (Michelangelo)
0.0.1 Crested Gecko (Picasso)
1.0 Ferret (da Vinci)
0.1 Chinchilla (Eevie)
1.0 Chinese Praying Mantis (Sid)
Melissas Menagerie