Are you able to return any of what you bought?
top and tail bath - not necessary. Just use any 2 random dishes/bowls that you have and fill with water and cotton wool.
baby bath - not neccesary. baby baths are a PITA to fill and empty unless you leave them inside the big bath which is a bit pointless you might aswell just use the big bath with a small amount of water in the bottom.
newborn insert - the foam ones are rubbish. they can roll off them at any time. the seat ones are rubbish as they are so high they keep them out of the water.
we had one of these which meant DS could lie in the big bath without getting water in his ears but the rest of his body could kick and splash about in the water.
cotton wool/cotton pads. i find the cotton wool pleats the best. that way you can tear off as much or as little as you need.
sudocreme - rubbish and sometimes irritates them further. the only nappy rash creams that work on DS are morhulin and antiseptic bepanthen cream (weirdly the actual bepanthen nappy cream didn't work). You can get boots to order both of these in for you. My friend found orabase and conotrane worked aswell.
Some natural remedies that worked with him are:
rooibos tea
cornflour mixed with water or vaseline
emu oil
grapefruit seed extract
egg white
manuka honey
vegetable glycerine
a baby hair brush - baby hair brushes are rubbish they just fluff the hair up imo. just get cheapo 15p plastic comb from the chemist instead.
baby nail cutters - a glass nail file is really good. i found i got jagged edges with scissors and emery boards and i was too scared of cutting ds with clippers.
nappies - obviously very necessary!!
towels - the poncho towels are best and last
a long time
flannel clothes - i just used my hand
sponges - i used a sponge for squeezing water out for hair washing rather than using a jug which most kids hate.
hooded towels - as above
baby toiletries - the only ones necessary are unfragranced baby shampoo and a bar of unfragranced soap. Soap bars have less chemicals in than liquid soap.