MadameG - here is a link to a very useful leaflet about formula.
It is produced by UNICEF. Have a look at the leaflet for HCPs.
Please have a look at the info about soya formula:
The Chief Medical Officer has advised(since 2004) that soya?based infant formulas should not be used as the first choice for the management of infants with proven cow?s milk sensitivity, lactose intolerance, galactokinase deficiency and galactosaemia (BNF 2009).
Whilst your baby may not have a proven intolerance etc you should ask group GP why he/she has not prescribed an alternative.
With regards to formula preparation you need to know that formula powder is not sterile.
The NHS and World Health Organisation advice is to make it with water which is 70 degrees C. (This is 1 litre of water boiled and left for 30 minutes).
DISCLAIMER - I am aware that there are some special formulas which have on pack instructions which state that a lower temp of water should be used. I am not advocating ignoring on pack info for special formulas - just making people aware - (of course there are circumstances where it is important for babies to have alternative formulas than to follow WHO guidelines).
There are ways of making formula in advance - please see leaflets linked below.
First step is that all formula normally says it can be made up to 2 hours in advance - so you can anticipate slightly.
Another alternative is a flask of water at 70 degrees.
Making in advance involves cooling ASAP and storing in a fridge at less than 4 degrees and limiting the storage time.
NHS formula preparation guidance for HCPs
WHO guidelines
Very Good Irish guidance - need to click on Guidance Note 22