I work in a very hot environment (oil rig in the tropics) and my advice would be consider the colours of the clothing you plan to wear. Light colours are best, they will get dirty and look bad but who cares? Anything blue or black or red would be out. A long sleeve light cotton shirt or 2 would be good item.
Lip Balm will be a must as you will get dehydrated at some point and so this will lead to cracked lips.
Consider taking hydralyte or similar electrolyte drink. Some people don't need them some people do, if you find your getting cramped at nights then you need them. Don't drink them like water just one or two a day. They sell them in small single serve pouches that we get at work and they are convenient and easy.
Keep your personal hygiene up. Use your wipes regularly and stay on top of it as sweat rash will not go away once it has set in on the trip.
Monitor your hydration levels. Observe the colour of your urine and try and keep it straw coloured, if it goes dark then drink more immediately. Keep a diary of how much you are drinking, if bladders are your choice then write down how many times you have filled it in a day. There is not hard and fast rule about how much you should drink but if you watch your urine colour and frequency then you will know if you are keeping up.
We have guys drop over from heat stroke at work semi regularly and it really buggers them up. Often their body is permanently unable to cope with heat for the rest of their life so be meticulous with this aspect.
Hope this isn't suck eggs stuff for you but good reminders if it is

Have Fun