You can use acid blend in place of the others. I don't add any to mine until later if at all so you may want to hold off and the same with the tannin. D-47 is a very popular yeast for meads. Also if you are making a traditional mead (with no fruit additions) you can skip the campden tablets and add the yeast after everything is mixed. Until you dilute honey its rather hard for anything to grow. But if you choose to add the tablets it will not hurt anything and if it makes you feel more comfortable add them just remember to wait a day to add the yeast. Yeast nutrients are a must for this type of mead because the yeast will not get much in the honey. Also when you add the honey, add it slowly, mix well and take the SG to keep the alcohol level at what ever you choose. I would add 4 lbs. and then take the SG and go from there. And last if you run out of that honey you can always add more of another kind to finish it off.
Have fun I'm trying to kick everyone out of the kitchen to start my blueberry and blackberry meads.
VPC